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100 Reasons the Earth is Old (reblogged from Age Of Rocks)

I am posting this page from Jonathan Baker’s Age of Rocks here for several reasons. It is an extremely useful resource, well researched and well-written; the author addresses creationists with humanity and respect, even as he demolishes their position; and the author himself is a committed Christian (why that should matter to me, a free-thinking atheist, is something I explain below).

Edinburgh to Siccar Point June-Jly 2012 048

Siccar Point. Horizontal Devonian sandstone over uptilted Silurian greywacke. Click and re-click to enlarge

The evidence presented ranges from tree rings to topography to sedimentology to physical geography to archaeology and anthropology to geochemistry to the fossil record to radiometric dating to astrophysics. Many of these are topics I have touched on, for example in my discussions of the unconformity at Siccar Point, and the slowly cooled multiple lava flows and palaeosols of the Giants’ Causeway.

In each case, the reasoning is briefly described, with links to more detailed discussions, many framed specifically to refute creationist claims. By relegating those claims to second place, the author avoids the common mistake of teaching the very error that he is warning against. At the same time, he pays a respectful attention to his opponents, for reasons that he explains elsewhere in his blog, even as he dismantles their arguments.

Like the authors of EvoAnth  and Leaving Fundamentalism, the author is at present a graduate student; welcome examples of how the web is democratising discourse, and how young scientists and educators are using the opportunity.

I commend this piece to all those who have to deal with creationism in schools and elsewhere, alongside such classics as 29+ Evidences for Macroevolution and Index to Creationist Claims, and hope that the author will continue to update and add to it as his own career progresses.

P1000089

Giants’ Causeway: interbasaltic laterite palaeosol between lava flows at The Chimneys. Click and reclick to enlarge

Like Dennis Venema at Biologos and Robert Wiens at Radiometric Dating – A Christian Perspective, the author is a committed Christian, thus helping to give the lie to the claim that Christian belief requires biblical literalism and the rejection of established science. This matters, since as I have argued before inviting creationists to abandon their deepest convictions is not likely to be the best way to change their minds. Research at Glasgow  agrees with me on this. Life science entry classes there contain a sprinkling of creationists, most of whom abandon their creationism during the course, but without necessarily renouncing their religion. I should for completeness state my own view on religion, which is that believers face major problems in accepting reality. But they are their problems, not mine, and it is not my place to tell them how to deal with them.

I have one small technical quibble. Paragraphs 73 and 74 seem, for reasons of brevity, to run together separate things under the heading “argon-argon dating”. These are: Ar-36/Ar-40 comparisons, used to subtract out the contribution of any argon initially present; Ar-39/Ar-40 that uses Ar-39, produced from K-39 by irradiating the sample, as a proxy for K-39 and hence for K-40 (this is what is usually meant by “argon-argon dating”); and finally, Ar-39/Ar-40 combined with controlled heating to distinguish endogenous Ar-40 (which will be released at the same temperature as the Ar-39) from so-called “parentless” Ar-40 that has diffused in from other rocks, which will be released more readily.

But I digress, and it is time to let Jon speak for himself:

100 Reasons the Earth is Old

How do we know the Earth is older than literalistic readings of the Bible seem to imply?

Nicolas Steno, pioneer in sedimentology and stratigraphy

Nicolas Steno (1638–1686), the Catholic bishop who formulated foundational principles in stratigraphy, paleontology, and even crystallography.

Geologists have been wrestling with this question for centuries, especially those pioneers in the Earth sciences (e.g. Nicolas Steno, William Buckland, Hugh Miller, Thomas Chalmers, and even Charles Darwin) who were also devout clergymen or at least trained in natural theology. The 19th century in particular may be characterized by the massive, interdisciplinary effort that sought to answer the question scientifically: how old is the Earth? But it was not until the mid 20th century that all efforts began to converge on the value we accept today: 4.56 billion years.

Today, a resurgence of young-Earth creationism has many persuaded that science, when applied faithfully, still supports a much smaller age—close to only 6,000 years. While the arguments behind this movement are not convincing to professional geologists, as I’ve sought to elucidate on this blog, their popularity highlights the need to summarize coherently the positive evidences in favor of ‘deep time’. Below, I have compiled what I deem the 100 most convincing reasons—in no particular order—that the Earth is not less than 10,000 years old.

Those readers from a young-Earth background might be quick to point out that many of the evidences listed below have been refuted by creation ministries in their article databases. But that’s no coincidence. Those article databases are primarily built to rationalize to what are indeed strong evidences against the young-Earth position. So please note, I am keenly aware of those counter-arguments, and therefore I encourage you either to follow the links to in-depth discussions of each evidence or to contact me directly about why I find such counter-arguments unsatisfactory.

How do we know from geology that the Earth is greater than 10,000 years old?

  1. Tree-ring “long counts” from California, Central Europe, New Zealand, and Scandinavia extend up to ~13,000 years. These chronologies are constructed from hundreds of individual trees that overlap, so that even if a tree did produce multiple rings during a growth season, the ‘extra years’ would disappear in the correlation process. Even John Woodmorappe has written that these tree-ring chronologies cannot be explained by multiple rings being produced in a single year or the mismatch of individual tree records.
  2. treering

    Annual bands in the cross section of a temperate tree (original image here).

    The oldest individual bristlecone pine trees date to ~5,000 years old by dendrochronology (ring counting), which is older than the traditional date for Noah’s flood. Since we have no reason to suspect that these trees could have formed multiple rings in any given year, these trees provide two constraints: 1) the flood, if it were global, occurred more than 5,064 years ago, and 2) the Earth’s surface, where the trees were growing, has been identical to modern day over the last 5,000 years. The latter point is important, because flood geologists must assume that catastrophic geological processes continued for centuries after the flood to explain Quaternary deposits and erosional features like Grand Canyon or the Channeled Scablands.

  3. Long-term records of glacial ice can be dated by counting annual layers beyond 10,000 years. These annual layers can be recognized not only by appearance, but variations in chemistry, which removes any assumptions about growth rate during these intervals and precludes the possibility that multiple rings formed each year.
  4. Varved sediments with more than 10,000 layers, such as Lake Sugietsu, Lake Van, and the Cariaco Basin, to name a few. Geologists don’t just assume that these layers are annual, but must demonstrate rigorously that each layer exhibits some kind of seasonal signal (characteristic isotopes, organic matter, or mineral content).
  5. From Figure 4 in Reimer et al. (2013): example of radiocarbon calibration, plotting the radiocarbon age of samples against their known age (between 34–45 ka).

    From Figure 4 in Reimer et al. (2013): example of radiocarbon calibration, plotting the radiocarbon age of samples against their known age (between 34–45 ka).

    Radiocarbon calibration curves confirm that annual layers in trees and varved sediments are indeed annual. The radiocarbon age of annual layers within these deposits are always within ~10% of the age predicted by layer counting, back to nearly 50,000 years. If these layers accumulated catastrophically, or if the radiocarbon method were fundamentally flawed, we should not expect such a match. Additionally, since YEC’s suppose that radiocarbon ages are only apparently old (due to low 14C concentrations during and after the Flood), every marine, tree-ring, and varved lake chronology must be compressed down to ~4,000 years. In other words, the YEC paradigm would predict that trees, glaciers, corals, and seasonally active lakes regularly form 4-10 ‘annual’ bands every year. But they don’t.

  6. There is no radiocarbon in old samples, despite claims to the contrary. Geologically old samples of coal, diamonds, and graphite, for example, yield finite radiocarbon ages that are consistent with the expected level of contamination invariably introduced during sample collection and preparation.
  7. Continuous coral chronologies from modern communities (i.e. not buried in sediments) extend throughout the Holocene. Corals contain annual bands and may be combined like tree rings to construct long-term chronologies, or dated by the radiocarbon and/or U-Th method. Applying these tools, geologists use corals to reconstruct sea level over the last few tens of thousands of years (or more!).
  8. stalagmiteTauriusCave

    Cross section of a stalagmite prepared for stable-isotope analysis. Drill pits are from powders collected for U-Th dating. Image from UT-Austin media release.

    Secondary cave formations, such as stalagmites, can form relatively quickly (1–2 mm/yr) in tropical climates or where summer monsoons bring large volumes of precipitation to the cave system. For caves found in temperate or arid climates, however, the growth rate of stalagmites can be incredibly slow (<0.1 mm/yr). Advanced techniques in U-Th disequilibrium dating confirm what geologists long suspected: these iconic formations took tens of thousands of years to reach heights of half a meter or more.

  9. Large subterranean caverns do not form overnight, especially outside of tropical climates. The dissolution of caves is a rather slow process, due to the limited solubility of calcite in very slightly acidic rainwater. Although the process can be accelerated in the presence of active soils or even hydrogen sulfide (a microbial byproduct of petroleum degradation), the sheer size of natural monuments like Mammoth Cave and Carlsbad Caverns cannot be explained in a young-Earth timeline, especially given that these caves are lavishly decorated by secondary formations, which themselves take thousands of years to form.
  10. Large terrestrial lakes and inland seas have accumulated more than 10,000 years worth of deposition. Examples include the Black Sea, Dead Sea, Caspian Sea, Lake Baikal, Great Salt Lake, Lake Van, Lake Ammersee, Lake Sugietsu, and Lake El’gygytgyn, to name a few. These lakes are dated by combinations of radiocarbon, annual band counts, and isotopic records that correspond to climatic trends from ice cores. Some contain evaporite layers, indicating that the lakes dried up in the past. In the cases of Dead Sea and Great Salt Lake, this happened many times in the past on glacial-interglacial scales.
  11. Lake Baikal in Siberia has collected sediments that are inconsistent with any catastrophic inflow from the surrounding region. The sediments at the lake bottom are rather fine-grained, free of terrestrial plant debris (aside from microscopic pollen near the shoreline), and contain abundant diatoms. These diatoms flourish in the summer months but settle very slowly to the lake bottom, so their presence throughout the sediment column confirms that sediments accumulated under normal conditions, similar to today. Therefore, we can confidently say that the lake basin is potentially millions of years old, given the sheer thickness of lake-bottom sediments.
  12. Well developed river flood plains span large areas of temperate and tropical regions of Earth. These flood plains develop over long intervals of time as periodic flooding and migration of the river channel slowly erode the bedrock down to a flat surface. Attempts to describe vast planation surfaces by the retreat of flood waters do not work, because during floods, erosion is localized in channels that form along ‘weak points’ in the underlying rock and sediment. If this erosion took place soon after the Flood, the sediment would still be soft, exacerbating the localization of erosion in deep channels.
  13. Slithering stone in Death Valley. Photo by Momatiuk - Eastcott/Corbis photography.

    Slithering stone in Death Valley. Photo by Momatiuk – Eastcott/Corbis photography.

    Painfully slow erosional processes in modern deserts, involving wind, ground tremors, or even ice, are the best explanation for some rather bizarre boulders scattered across the dunes. Slow tumbling boulders in South American deserts, for example, had to be weathered slowly by wind in the arid highlands, and cosmogenic dating confirms their old age. Slithering stones of Death Valley, on the other hand, were proven to move only by seasonal ice. These findings imply that the modern landscape has changed little in thousands of years (if not millions!).

  14. Evidence for numerous glacial cycles during the Quaternary (i.e. the past 2.6 million years) is particularly abundant in the northern hemispheric continents of North America and Eurasia. These evidences include glacial tills and terminal moraines, which are buried within layers of Quaternary aged sediments. Between these glacially derived layers, relatively warm-weather plants populate the sediments of old river valleys, indicating that climate rebounded after each ice age to one similar to what we find today.
  15. Quaternary deposits and landscapes are far too complicated to have accumulated in the ~4,500 years following the Flood. Everywhere we look on Earth, we truly find evidence for ~2 million years worth of processes, whether at high latitudes (where we find evidence for repeated glaciations and deglaciations, separated by warm intervals) or in the tropics (where we find thick desert dune sequences alternating with humid intervals) or in the oceans (where 2 million+ years of Milankovitch cycles are recorded in only a few meters of silt and clay) or in the high mountains (where alpine valleys have been carved out by rivers or glaciers, then infilled by coarse sediment, then eroded again, etc.). Flood geologists unanimously assert that the Quaternary period represents the ‘post-Flood’ era, but there is good reason that conventional geologists ascribe a much longer age: 2.6 million years.
  16. Glacial tills from ancient glaciations, such as the ‘Snowball Earth’ episodes in the Late Proterozoic
    Dropstones in a glacial diamictite from Death Valley, California.

    Dropstones in a glacial diamictite from Death Valley, California. Image credit.

    and cold intervals beginning the Late Ordovician and Late Pennsylvanian periods, are found within the geological record and so must be reinterpreted by Flood geologists as submarine deposits of boulders and mud during Noah’s flood. Though ancient tills do occasionally resemble submarine flows, ancient glaciations are not inferred by these sedimentary deposits alone. Instead, a suite of geological data, from fossils to paleoceanographic data to rock chemistry, all support the idea that the whole Earth was much cooler when these tills were deposited.

  17. Continental ice sheets do not form in a matter of centuries, especially those that were more than a mile thick and extended in some cases to southern Siberia and the central Great Plains, USA. Flood geologists must maintain, however, that massive ice sheets nearly half the size of Russia not only grew, but melted entirely, then regrew, melted entirely, and regrew more than a dozen times in less than 200-700 years (the timeline depends on which YEC you ask!).
  18. Human occupations of nearly every continent can be demonstrated beyond 10,000 years, e.g. in South Africa, ruling out the possibility that humans repopulated the Earth after being obliterated only ~4,500 years ago.
  19. Ötzi the Iceman has frequently made headlines in creationist writings, because they accurately perceive this unique find as a challenge to the young-Earth timeline. The remains of this murdered Alpine farmer date to ~5,300 years old, which YEC’s arbitrarily dismiss as “inflated”. Regardless, they do admit that he lived sometime in the beginnings of human civilization (i.e. very soon after the Flood), and so they attempt to turn the argument on ‘evolutionists’ by emphasizing the level of technology (tools, agriculture) carried by Ötzi and his village—”How can this ‘primitive’ man be so advanced?” This response is a non sequitur, because the artifacts found with Ötzi are entirely compatible with reconstructed histories of European peoples. What YEC’s overlook is the geological context of the body: it was preserved in undisturbed ice near the top of a mountain range. This tells us that the morphology of the Alps has changed very littlesinceÖtzi was alive. So when did theAlpshave a chance to shed the kilometers of sediment that once covered their peaks? ThemountainsinwhichÖtzi wasfoundare indeed very ancient, far older than the body of this 5,300-year-old village outcast.

    Ötzi the Iceman, trapped in ice ~5,300 years before present and nearly perfectly preserved (stomach contents and all!).

  20. Human settlements that are now submerged due to sea-level rise have been documented beneath the English Channel, North and Baltic seas, off the coast of Israel, Florida, and beneath the Black Sea, to name a few. For much of human history, global sea level was up to ~130 meters lower than today, exposing far more of the continental shelves and pushing ancient coastlines far away from their modern locations. This allowed for human settlements to develop in sites that are now completely submerged. Following the ice age, however, sea level rose sharply and reached near modern levels at ~8,000 years ago. Whatever the absolute timeline, the young-Earth view allows too little time for human populations to develop, migrate across the globe, and construct large settlements prior to the sea-level rise following the ice age (which they assert happened only a few centuries after Noah’s flood).
  21. Fossils record long histories of migration of animals from Eurasia to the “New World”, which cannot be accounted for in the young-Earth timeline. Large mammals such as mammoth, mastodon, and giant sloth reproduce far too slowly to account for the population sizes indicated by fossil graveyards between Siberia and the Americas.
  22. There is no record of migration from Central Asia to Australia for many species unique to the land down under. Their ancestors, however, are found in the fossil record and imply that modern populations derived from species that arrived to the island well in the distant past, not after the Flood only ~4,000 years ago.
  23. Modern oceans are too salty to have been formed only ~6,000 years ago. We know this salt was delivered slowly to the oceans mainly via rivers (i.e. as opposed to being created in situ), because the relative abundance of salts in the ocean is related to their relative solubilities and abundance in the Earth’s surface.
  24. Cenozoic aged marine sediments in the Gulf of Mexico or along the west African and east South American coastlines, for example, are far too thick to be explained by ‘post-Flood’ processes. This fact has caused some YEC’s, such as Michael Oard, to push the ‘post-Flood’ boundary later and later into the Cenozoic and consider these marine sediments as Flood deposits. However, the structure of marine sediments in the Gulf of Mexico and the equatorial Atlantic is clearly related to the modern topography, where large rivers like the Mississippi, Amazon, Congo, and Cross have dumped tons of sediment into the seas, causing massive deltas to form over long periods of time. Due to the economic reward for exploring these sites (which contain abundant oil), geologists have thoroughly mapped out the evolution of ancient deltas through miles of sediment. Their result ubiquitously inform us that the modern landscape is very old and rather stable, and that these late Cenozoic marine sediments were not deposited through catastrophic processes, but by everyday rivers at rates observed today.
  25. Deep ocean sediments take far too long to settle to have accumulated in less than 5,000 years. Today, the entire seafloor is covered with microscopic species of plankton, diatoms, radiolaria, etc., in addition to tiny bits of clay and calcite. These particles are so small, that they would remain in suspension under flowing water, so their presence on the seafloor must be explained by a long-time in which they could settle through miles of seawater. The history of seafloor sediments is further amplified by the fact that marine tephra (volcanic ash layers) occur throughout marine cores around the world, but volcanic ash also needs time and calm water to settle out.
  26. santorinideposit

    A 3,500-year-old volcanic ash deposit from Santorini volcano, in three stages: an air fall pumice (bottom), followed by laminated ash that formed underwater (middle tan layer), covered by a pyroclastic flow (top white layer). Photo by Lee Siebert found here with full description.

    Volcanic ash beds (sedimentary tuff), frequently used to date sedimentary rock layers, were mainly deposited in dry conditions. Geologists can distinguish between ash layers that settled in ocean basins (marine tephra) and those that fell over dry land (air fall deposits). When volcanic ash is deposited in flowing water, it produces yet different features identifiable in outcrops, such as grain sorting and lamination. Therefore, not a few volcanic ashes in sedimentary strata contradict the Flood geology scenario, especially because these ash falls take time to accumulate from the air and harden to the point that water-lain sediments can be deposited on top without compromising the structure of the soft ash.

  27. The geologic column is no remnant of an ancient flood deposit, global or not. Fine details, in the form of thin layers of alternating clay and limestone, or irregular sand deposits that resemble modern river channels, defy catastrophic explanation, which explains why catastrophism has long been abandoned by research geologists.
  28. There are simply too many sediments buried in the crust to be explained in a young Earth. Contrary to the claims of Andrew Snelling, the ocean floor contains about as much sediment as we might expect after ~160 million years. In addition to ocean sediments still underwater, however, YEC’s must also explain the origin of the trillions of trillions of tons of limestone, sandstone, and mudstone now buried on the continents. These sediments, comprised of broken down minerals, must have originally weathered from igneous or metamorphic material, after which it was sorted by size through surface processes (like rivers, winds, and gravity). But this is not a rapid process, inviting the question: even if a global flood could have buried this much sediment (it can’t), what is the origin of the sediment in the first place?
  29. The distribution of sedimentary rocks is weighted too heavily over the continents, which is the opposite of what we’d expect in a global flood. Floods move sediments from high elevation to low elevation, depositing them in sedimentary basins. During the Flood, the oceans would have constituted the largest and deepest basins, but most sediments remainedonelevated continents. How did this happen? Did the laws of physics stop working?

    greatunconformity

    The “Great Unconformity” in Grand Canyon. Photo by Marli Miller.

  30. Angular unconformities became one of the principal evidences against catastrophism in the 19th century, and for good reason. For an angular unconformity to develop, a sequence of sedimentary layers must be deposited horizontally, then tilted or folded above horizontal, then eroded along a flat (or nearly flat) surface, after which new layers are deposited horizontally on top of the erosional surface. We can explain all these steps through modern geological processes. Flood geologists, on the other hand, must explain 1) how these horizontal strata became angled amid the flood, 2) had time to erode to relatively flat surfaces, and 3) why we do not find deep canyons associated with unconformity surfaces, since deep, rapid flowing water would tend to carve into the unconsolidated sediment.
  31. This buried landscape, for which little explanation is needed, absolutely defies Flood geology. It is rather a testament to deep time, in which an ancient river valley cut its way though thick sequences of sedimentary rock, only to be buried suddenly and preserved in subtle disconformities between the overlying layers. But these disconformities make for excellent acoustic reflectors, and so the ancient landscape is visible through seismic imaging—a way of treating the Earth to a million-dollar ultrasound.buriedlandscape
  32. Sedimentary features in limestone are similar to those forming today in shallow marine environments. Everything from ooids (tiny spheres that build up like snowballs under wave action) to cross bedding to mudcracks to karst dissolution in ancient limestones falsifies the young-Earth timeline, because these limestone formations were deposited in calm, shallow seas—not a deep, worldwide flood.
  33. Exposure surfaces in limestone are recognizable through features like mudcracks, hardgrounds, and karst dissolution. Karst erosion takes place when relatively acidic waters (like fresh rainfall) dissolve cavities in exposed layers of hardened lime mud. Since karstic surfaces are found throughout the geologic column (including in the Redwall Limestone of Grand Canyon), we can rule out the possibility that limestone layers accumulated under a global flood.
  34. Carbonate rocks (limestone and dolostone) comprise more than 20% of all sedimentary rocks, but Flood geologists cannot explain extensive formations of dolostone—(Mg,Ca)CO3—which forms only under unique conditions not seen today in the oceans. To avoid the problem, they speculate that enhanced delivery of magnesium to the ocean (via deep-ocean vents, or the “fountains of the deep”) would havedriventhe formationofdolostone during the Flood. But in fact, dolomite does not form under these conditions, and so the Flood geology model predicts rather that mostcarbonatesshouldbecomprised of aragonite, the high-magnesium variant of calcite. Every piece of dolomite in the geologic record is firm evidence against the Flood model.

    Areal extent of some major evaporite deposits. Image from Paleobabbler.

  35. Flood geology cannot explain the size and presence of massive evaporite deposits in basins like the Gulf of Mexico or the Mediterranean Sea (a small sampling of the world’s sedimentary salt). Halite (NaCl; same as the salt on your food) is extremely soluble in water, especially at higher temperatures. Therefore, Flood waters would have had to evaporate within individual basins until <10% of the original water mass remained (meaning millions of cubic kilometers were evaporated!). Again, this would imply that the ground was exposed at numerous points during the Flood (contrary to scripture). But it also requires that extreme evaporation could persist over significant intervals of the Flood (during which no water flooded the basins?), which is not physically possible. Evaporation stops when relative humidity in the atmosphere reaches ~100%, but the more water is evaporated, the greater the relative humidity becomes. At 100%, the humidity returns to the ocean as rain. Thus the hydrological cycle would have prevented any large basin from evaporating enough water to deposit halite over its base.
  36. The size and thickness of chalk deposits has frequently been cited as solid evidence against the flood. Young-Earth geologists (esp. Andrew Snelling) have responded by offering pseudo-scientific calculations that supposedly account for the global mass of chalk. These calculations are scientifically meaningless, however, because 1) they assume that coccolithophores (which form chalk in the surface ocean) sustained unreasonably high productivity rates over a significant portion of years leading up to the Flood, 2) that the “fountains of the deep” provided nutrients to the surface ocean (instead of poisoning them, as discussed above), and 3) that all chalk produced prior to and during the Flood could have settled in a coherent deposit at the bottom of the sea (rather than remaining in suspension and mixing with other particles in the surface ocean—a more likely scenario if the Flood was accompanied by strong currents).
  37. Syntectonic deposits are abundant throughout the sedimentary record. As the name implies, syntectonic deposits form simultaneously with tectonic deformation of the local geology. If you’ve ever seen an alluvial fan collecting sediments from the side of a mountain, especially near a large fault, then you can visualize the painfully slow process in action. As the mountainside is exposed little by little, due to adjacent valley dropping in elevation every time an earthquake hits, pebbles and boulders are episodically washed into the valley. Because syntectonic deposits contain eroded pebbles and boulders of underlying sedimentary rocks, their presence in the geologic column makes no sense within a ‘Flood geology’ interpretation. Those underlying sediments must have been solid before they could be broken off and polished into smooth boulders found inmostsyntectonic layers.

    Syntectonic deposits in Echo Canyon Utah. Original photo by Matt Kuchta.

  38. Large extensional basins, such as Death Valley and the Great Basin in the US, contain thousands of meters of coarse sediments that were eroded from the adjacent ranges. These basins only deepen when infrequent, large earthquakes cause the valley to drop 1–2 meters at a time. Even if we allow that earthquakes were more frequent in the past, there is a limit to how fast semi-arid valleys can collect millions of tons of boulders in their center, because major flooding events are required to move these sediments several miles over a shallow slope.
  39. The total offset in large transform faults, such as the San Andreas fault, points to a very long history of slow deformation. Since its inception, the San Andreas fault has separated sedimentary deposits that appear on both sides by 150 miles, but the average slip rate today is only ~5 cm/yr. One could argue that the rate was higher in the past, but there is no direct evidence for this, and large episodic earthquakes can shift the fault blocks locally by only a few meters. On the other hand, there is evidence from the offset of modern gullies and streams that movement has been just as slow in the past.

    Offset of a small creek along the San Andreas fault. Image from Zielke et al. (2012).

    Offset of a small creek along the San Andreas fault. Image from Zielke et al. (2012).

  40. Radiometric dating confirms that modern slip rates of tectonic plates, as estimated by GPS data, remained relatively constant over millions of years. The ability to predict radiometric dates by uniformitarian ‘assumptions’ strongly corroborates plate tectonic theory and removes the assumption of uniformity of process.
  41. The abundance of oil in sedimentary rocks completely contradicts the young-Earth timeline, because oil cannot form within ~5,000 years at temperatures less than ~300°C—far greater than is found in every oil and gas field today. At best, the young-Earth scenario might predict sparse fields of natural gas, being produced by decaying organic matter, but instead we find hundreds of reservoirs containing billions of barrels of oil.
  42. There is too much organic matter in Earth’s crust to have been buried in a single flood event. Flood geologists must contend that most (if not all) of this organic matter—called the biomass—was alive or only recently deadjustprior to the flood. Coal and oil reserves are the most obvious examples of ancient biomass, but nearly every sedimentaryrockcontains a little (up to 1%) by weight. When allsourcesare taken into account, we find that the biomass buried in Earth’s crust is 3,000 times larger than what is found today—far more than could have been present on Earth at any given time.

    Early Cretaceous plant fossil in coal. Photo from Wikipedia commons.

    Early Cretaceous plant fossil in coal. Photo from Wikipedia commons.

  43. Coal beds defy rapid deposition, because the high concentration of organic matter begins with the slow accumulation of plant material in oxygen-poor swamps (and not by rapid burial of floating forests). The occasional preservation of leaves and woody material in coal seams would not be possible if all the buried plant material were fresh to begin with (as with rapid burial of existing forests), but requires that organic remains be at varying stages of decomposition.
  44. Coalification (turning plant matter into high-grade coal) is a slow process, which cannot be compressed to the young-Earth timeline. Experimental attempts to make artificial coal (cited by Snelling here) have only produced very low-grade lignite and coalified wood. Furthermore, these experimental setups (which do require high pressure/temperature and up to several months) rarely reflect natural settings and have yet to produce coal that closely resembles natural samples.
  45. If the majority of the Earth’s sedimentary rocks were deposited within a single flood, then those sediments should all be at approximately the same temperature today, and that temperature should be similar to the average water temperature during the Flood. It would take millions of years for a smooth temperature gradient to form (cool at the surface, hotter nearer the mantle), which is what we find today in deep wells.
  46. Remnants of soft tissue are extreme rarities in sediments older than Quaternary, possibly preserved in a handful of samples around the globe. Paleontologists continue to debate, for example, whether soft tissue in dinosaur bones derived from actual dinosaurs or microbial biofilms. But whatever the answer, we can all be confident that soft tissues are not regularly recoverable from Paleozoic and Mesozoic fossils. If these organisms were buried less than 5,000 years ago, however, soft tissues should be the rule, not the exception. According to the YEC timeline, mammoths and other megafauna died only years to centuries after the dinosaurs, yet we find hair, collagen, and even DNA in these animals all the time. So why not in dinosaurs and trilobites?
  47. Contrary to what we might expect from a Flood geology scenario, deep reservoirs of groundwater are not remnants of ancient oceans, but were accumulated by infiltrating rain and snow. Whenever oil companies drill deep into sediments, they always encounter very salty water (called connate water), whichhasto be pumped before oil is accessible. It was originally thoughtthatthe salinity of these waters derived from the oceans in which thesedimentswere deposited, but their chemical and stable-isotope signatures contradicted this hypothesis. Flood geology has no room in its
    Polystrate tree fossil. Note the base of the stump is rooted in a more organic-rich deposit, while the top of the tree is truncated sharply. Photo from Wikipedia commons.

    Polystrate tree fossil. Note the base of the stump is rooted in a more organic-rich deposit, while the top of the tree is truncated sharply. Photo from Wikipedia commons.

    timeline for sedimentary rocks to have been ‘flushed out’ by infiltrating precipitation, because deposition would have to occur too rapidly. If the geologic column were deposited in a global flood, therefore, we should expect the groundwater trapped in deep sedimentary layers to be the very ocean water that once covered the Earth.

  48. Contrary to YEC claims, polystrate fossils are better interpreted by conventional geology and contradict the Flood geology paradigm. Most polystrate trees are rooted in organic-rich layers such as coal seams or paleosol beds. In other words, the trees were growing in place when covered abruptly by rising floodwaters, and were not uprooted and transported long distances. This means that after the formation of the coal/paleosol, there had to be time for a forest of trees to grow several meters, after which a large flood (not global, just the kind that would engage our National Guard today) buried whole stumps up to a couple meters with sand and mud. In all occurrences of polystrate trees, the tops of the trees are missing (truncated), having rotted off after they were exposed above the sediments for a long time.
  49. Fossilized burrows and marine trackways reflect everyday conditions in ancient ecosystems, where worms, trilobites, or molluscs dug calmly through soft mud on the seafloor in search of food. The claim that paleontologists have unanimously mistaken these trackways for escape efforts during a catastrophic flood is not only presumptuous, but it ignores the bulk evidence.

    Trilobite trackway in Cambrian sandstone. Image from PaleoSearch.

  50. Mudcracks are common features in layers of sand, silt, and clay that are interpreted to have formed in floodplains or shallow lakes and tidal flats. Despite decades of being aware of the problem, Flood geologists have not satisfactorily been able to explain why mudcracks cover thousands of individual layers throughout the rock record. These features do not form under water, but require an exposed, drying surface of semi-cohesive sediment.
  51. Ripples readily form in sandstone under flowing water, but not at speeds required by the Flood. Therefore, the common preservation of small ripples cannot be reconciled with the Flood model, but rather tells us that the sand must have been buried in calm seas with gentle waves.
  52. Raindrops on the surface of sedimentary layers—these are relatively self-explanatory. If we take Genesis as our guide, sedimentary layers could not be exposed during the course of the Flood, and so we should never expect to find raindrops imprinting their surface. Even if we do allow forthisunbiblical possibility, however, raindrops imprints cannot be preserved if they are swiftly covered by a new layer of sediment. For raindrops to become ‘fossilized’, theimprintmust be made in a semi-cohesive layer (i.e. one that is not saturated with water, but not completely hard), which needs time to
    A 15-million-year old piece of poop, called a coprolite. Image credit.

    A 15-million-year old piece of poop, called a coprolite. Image credit.

    harden slightly in the absence of flowing water before another layer is deposited on top. Raindrops in sediments contradict flood geology outright.

  53. Fossilized poop, called coprolite, is found throughout the fossil record alongside the animals that produced them. These paleontological oddities are indicative of normal ecological conditions and contradict any scenario in which the ‘poopers’ were catastrophically buried.
  54. The nature of the fossil record contradicts the expectation of ‘rapid burial’ for most land-dwelling organisms. By and large, terrestrial fossils are the weathered remains of animals, which were long exposed to the elements before disarticulating and washing into a river channel, lake, or floodplain. Vertebrate skeletons are almost never found intact, and more weather-resistant pieces (like tooth enamel) are preferentially preserved, suggesting that rapid (live) burial was an extreme rarity in geologic history.
  55. Fine sorting of marine microfossils is inconsistent with the Flood scenario, because specimens of foraminifera, radiolarians, and coccolithophores are approximately the same size. Therefore, these tiny shells should be scattered stochastically throughout the sedimentary record, if they were subject to the same hydrodynamic forces of a single global flood. Instead, individual species are commonly confined to narrow zones in the fossil record and used as index fossils for dating layers of marine sediments.
  56. Cast replica of footprints made by a mammal-like reptile in the Coconino Sandstone near Ash Fork, Arizona. Photo credit: PaleoScene.

    Fossilized tracks in eolian (desert dune) deposits, such as the Coconino and Navajo sandstones, are inconsistent with the young-Earth proposition that these sediments accumulated under water. Extremely high sustained flow rates (>2 m/s) of very deep waters (up to 100 m or more) are required to form dunes of comparable size to those in the Coconino and Navajo sandstones. At these flow rates, it would be impossible for any submerged animals (especially small reptiles) even to make contact with the sediment surface, let alone for any prints to be preserved.

  57. The occurrence of widespread, eolian sandstone formations negates any model that cites a worldwide flood to explain their deposition. Of course, Flood geologists attempt to argue that eolian sandstones must have been laid down by water (more than 100 meters deep, flowing more than 2 m/s), but ignore the preponderance of evidence, which is more consistent with dry dune deposition.
  58. Paleosols are sedimentary layers that show evidence of soil formation by plants and microorganisms. Typically they can be recognized by distinct mineral compositions or chemical signatures, but direct reworking of sediment through biological agents may also be observed (for example, in situ roots and carbonate nodules). Not all paleosols show the same degree of soil development, but all are indicative of a long-lasting stable surface. YEC’s are forced to reinterpret paleosols as artifacts of chemical modification after rapid burial during the Flood, but geologists have become acutely aware of how to distinguish between these processes and true soil horizons.
  59. Animal tracks in general are evidence of an exposed surface, on which sediments were somewhat coherent (i.e. not too soft, not too hard; imagine trying to preserve your own handprint in cement). Nonetheless, YEC’s have deemed trackways consistent with their paradigm, because they insist that the floodwaters receded and covered the land numerous times. Besides the fact that Genesis 8 tells us the surface was not exposed until very late in the flood (and so their model contradicts scripture), it is very unlikely that any tracks could be preserved in those conditions. Once the floodwaters returned, they would tend toward erosional processes (removal of the entire surface layer, tracks included). The Flood model firmly predicts the absence of trackways in the sedimentary record, but in fact they are abundant.
  60. Fossilized nests, e.g. from dinosaurs, are indicative of stable, everyday ecosystems, and not catastrophic flooding of the continents. Both nests and eggs are fragile, which explains their rarity in the rock record. But abrupt burial in a high-energy flood cannot possibly explain their occasional preservation.
  61. The Grand Canyon was eroded and widened slowly by annual precipitation, as evidenced by the fact that the North Rim lies further from the main course of the Colorado River. A very gentle slope causes more runoff to enter the canyon from the north side, which, as Wayne Ranney (2012) explains, allows “for more erosion in the side streams on the north side of the river. For this reason, the North Rim is eroded away from the river about twice as far as the South Rim.”
  62. The Grand Canyon itself is only deepened episodically during extremely high floods, which do not regularly occur in the modern climate of northern Arizona. Therefore, it must have taken numerous glacial cycles, during which the jet streams migrate southward and bring more rain/snow to the American southwest, to account for the great depth of the canyon today.
  63. The walls of the Grand Canyon contain numerous caves with speleothems, implying that the water table once stood high above its present position for extended periods of time. Catastrophic carving of the Grand Canyon cannot possibly explain these features, because it allows no time for caves to form and no mechanism by which they could be decorated with stalagmites and stalactites.
  64. Figure 1 from Noffke and Awramik (2013). Modern and ancient examples of stromatolites and microbially laminated structures.

    Figure 1 from Noffke and Awramik (2013). Modern and ancient examples of stromatolites and microbially laminated structures.

    Stromatolites and thrombolites are fine-laminated mounds built by algae and other microorganisms. These features not only take long periods of time to form, but their occurrence in repeated sedimentary layers argues strongly against catastrophic burial. They do not appear randomly in the geologic column, but are always positioned upright (in situ growth position) over wide areas within single layers of limestone—precisely what we’d expect if they grew in ancient oceans that slowly amassed limestone mud. Finally, these laminated mounds are frequently surrounded by fragmented shells of shallow-marine organisms typical of the same environment.

  65. Consistent patterns in magnetic reversals recorded on the seafloor strongly support the conventional model of plate tectonics, in which slowly forming oceanic basalts record the dominant magnetic signature at the time they were formed. YEC’s contend that these magnetic reversals occurred rapidly during the flood, but this proposal is easily falsified. If the entire Atlantic and Pacific basins formed during and/or shortly after the Flood, then Earth’s polarity would have reversed multiple times before oceanic basalts even had a chance to cool and preserve the signature! Flood geology thus predicts that either a single polarity signature should persist across ocean basins or the signature should be stochastic, with no striped pattern.
  66. Magnetic reversals recorded on the seafloor correlate to magnetic patterns in land sediments (e.g. Heller and Tung-Sheng, 1982; Cunningham et al., 1994; Ding et al., 1999), vastly improving the dating of continental deposits that lack datable layers of volcanic ash. Where ash layers do exist, they allow for independent dating of magnetic reversals on land by the Ar-Ar method. This independent corroboration of dates improves the strength of magnetic ‘stripes’ on the ocean floor as evidence for an ancient Earth.
  67. Earth’s magnetic field is not decaying exponentially, but has varied much less over the past 7–9,000 years (e.g. Korte et al., 2011; Nilsson et al., 2014). Magnetic field strength was weaker, not exponentially stronger, for much of this interval. Attempts to suggest that the Earth cannot be older than 10,000 years due to an exponential decay of Earth’s magneticfieldare based on a blind extrapolation of historical measurements (which span no more than 150 years) into the past. This approachignoresthe abundance of paleomagnetic data from human artifacts, sediments, and recent lava flows.

    Fig6cd_Nilssonetal2014

    Figure 6c-d from Nilsson et al., 2014. Modeled history of the dipole moment of Earth’s magnetic field over the past 9,000 years, based on magnetic field intensities recorded by archaeological and geological samples.

  68. The entire field of chemostratigraphy makes no sense within Flood geology. First, the stratigraphic shifts in chemistry—meaning, as we analyze rock chemistry from the bottom of the geologic column to the top—are too large to have occurred during a single year. This is true particularly of isotopes of carbon, sulfur, and strontium, because the amount of these elements dissolved in the ocean is too large to be greatly affected within a short period of time. It would be like trying to change the water color of a swimming pool by dumping in a few cups of coffee!
  69. Event stratigraphy, which utilizes abrupt shifts in rock chemistry as time markers, helps geologists to correlate sedimentary rocks from very different parts of the world. When we examine sequences of sedimentary rocks that are rich in fossils, the order and timing of chemical events just happens to correspond to the order and timing of fossil events (e.g. the disappearance or first appearance of certain fossil species). This correspondence is not possible in the flood geology model, however, since the ordering of fossils in various parts of the world could not have been a matter of timing (i.e. it couldn’t depend on which day of the Flood they were buried).
  70. The mere existence of isotopes is not predicted by the young-Earth paradigm, but makes sense only in conventional astrophysics. Nearly all elements of the periodic table exist in various isotopes, due to their being formed in the process of stellar evolution. As stars grow larger, heavier elements are produced through nuclear synthesis. Outside of this mechanism, we should not expect isotopes to be a common feature in basic chemistry.
  71. Short-lived isotopes are detectable only from distant supernovas. These are unstable elements that decay relatively rapidly after formation and so should be absent in a 4.5-billion-year Earth. This discrepancy provides unambiguous support for the conventional age of our solar system and models of stellar evolution.
  72. Radiometric dating of chondritic meteorites is consistent between methods and yields ages of 4.56 billion years for our solar system. It is currently inconceivable how this date could be wrong by a factor of 1 million.
  73. Potassium-argon dating is well known for its potential problems, but still provides one of the best methods for dating ancient volcanic flows. Even when excess argon is originally present, as is evident in the dating of certain historical eruptions, the date is only apparently too old by a few million years at most. Therefore, K-Ar dates in excess of tens or hundreds of millions of years tell us clearly that the Earth is not young, because otherwise, we could not explain such high concentrations of argon in these volcanic rocks.
  74. The Argon-Argon technique removes most uncertainties about the original presence of excess argon in samples, confirming that K-Ar dates are both real and generally accurate. Corroboration of Ar-Ar dates by other methods—e.g. when applied to the Cardenas Basalts of the Grand Canyon—further improves our confidence in the respective techniques.
  75. Uranium-Lead dating techniques consider the decay of multiple isotopes (238U, 235U, and 232Th) into stable forms of lead. If the respective half-lives of these elements changed significantly in the past, then the technique simply wouldn’t work, because each half-life is vastly different. Accelerated nuclear decay, in other words, would result in massive discordance between age estimates from each decay chain. However, the U-Th-Pb method, especially when applied to pristine zircons, provides one of the most precise geochronometers for the bulk of Earth history.
  76. Flood geologists cannot account for the abundance of 230Th in secondary calcite deposits, such as speleothems, carbonate lake sediments, and corals. Since thorium is not soluble in oxidized water, these formations originally contained none. Therefore, present concentrations can only be accounted for by radioactive decay of 234U into 230Th, which has a half-life of 245,000 years. If modern corals, lakes, and cave deposits formed only after a global flood, some 5,000 years ago, then none should yield dates older than this.
  77. Cosmogenic dating utilizes short-lived isotopes that are created in situ by incoming solar radiation or high-energy particles from space. When rocks are exposed to the atmosphere, such as large boulders on the side of a mountain, they accumulate short-lived isotopes. When rocks and minerals are hidden, through burial under sediments or ice, short-lived isotopes decay at a known rate. Through a variety of methods, geologists have used cosmogenic dating methods to constrain the buildup and retreat of large ice sheets, development of alluvial fans, river plains, deserts, and other surface features across Earth. Of course, these dates invariably suggest that the most recent deposits on Earth are not less than 10,000 years.
  78. There is too much helium in zircons, contrary to what Russell Humphreys has conjectured in his unscientific analysis. Geologists regularly use the amount of helium in certain minerals to constrain rates of tectonic uplift, because it accumulates at a known rate (dependingonthe concentration of Uranium/Thorium), so long as the mineral stays below a threshold temperature. This method (U-Th-Hethermochronology) regularly yields ages of tens of millions of years, which is to say that many millions ofyearswere required to account for modern concentrations of helium.

    F14.large

    Cartoon illustration to explain formation of a particular type of ophilolite. From Rolland et al. (2010).

  79. Ophiolites are remnants of ancient oceanic crust, which have been thrust onto the continent. Geologists were originally confused by the large bodies of ultramafic (super rich in Fe and Mg) rocks on land. But by studying the chemistry and mineral composition of ophiolites, geologists recognized their oceanic origin and could identify the processes responsible for their formation. As it turns out, most ophiolites were formed near subduction zones (e.g. like we find around the Phillipines), and not in mid-ocean ridges. We know this because subduction of ocean sediments and crust influences the chemistry of newly formed lavas in a very specific way. And so, ophiolites tell a much longer story than the YEC could allow, in which 1) ancient (pre-Flood?) oceanic crust began to buckle until one plate subducted beneath another, 2) forming an island chain like Japan, which 3) began to stretch away from the continent, 4) allowing new oceanic crust to form, until 5) the entire suite was crumpled up as the island chain collided with the main continent, 6) ultimately preserving portions of the ocean crust and overlying sediments on land. Each of these steps requires more than a few thousand years.
  80. Cosmogenic beryllium (10Be) is present in volcanic emissions above young subduction zones, but absent in older ocean sediments. This radioactive isotope is formed continuously in the atmosphere, much like radiocarbon, but has a much longer half life. It is useful in dating certain marine cores, since the concentration of 10Be decreases with depth—as expected if the ocean sediments accumulated over millions of years. The fact that 10Be is present in younger subduction zones, such as the Lesser Antilles, indicates that ocean sediments were subducted and then recycled back into recent volcanic flows within a few million years. Since 10Be is absent, however, from the majority of volcanic emissions and from ocean sediments that are older than Pliocene in age, we can be confident in their conventional ages (>5 million years).
  81. Large igneous bodies take time to cool, such as those that comprise the core of the Sierra Nevadas, Andes, Rocky Mountains, and other large mountain belts around the world. Even in the presence of circulating waters, the sheer amount of heat originally present in magmatic intrusions requires hundreds of thousands to millions of years to dissipate, before the magma may crystallize completely into solid rock. This process is slowed significantly by overlying sediments, which act as insulators.
  82. Coarse-grained granite from the Town Mountain Granite.

    Coarse-grained granite from the Town Mountain Granite.

    Coarse grains in igneous intrusions confirm that they indeed cooled very slowly, and not by rapid dissipation of heat via water or any other process. Only slow cooling allows for large, distinct minerals to form (called phaneritic texture), as is common in granite and diorite. Whenever you find a rock that resembles the image to the right, you have met a witness against the young-Earth paradigm.

  83. The intrusive igneous rocks exposed today were formed at great depths, indicating that miles of solid rock had to be weathered and eroded in the past. Even under catastrophic conditions, this process alone could take tens of millions of years. Today, granite exposures such as in the iconic Yosemite Valley continue to uplift in response to the removal of the overlying rock.
  84. Volcanic sills, which are intruded between sedimentary strata, require that the layers be hardened first. Otherwise, these lava injections have no physical guide that would confine their shape to lateral sheets of basalt. It is the brittle break between solid sedimentary rocks that causes volcanic sills to parallel the direction of bedding. Where is there time in Flood geology for sediments to harden completely, then to fracture and allow injection to form a sill, and finally time for cooling of the lava itself into solid rock? Volcanic dykes similarly require brittle fractures in the rock layers to explain their shape.
  85. Volcanic island chains, such as Hawaii, elucidate the multimillion-year effects of plate tectonic theory. Migrating lithospheric plates (and/or ‘hot spots’) cause the center of volcanic activity to migrate in a roughly linear pattern, resulting in a long chain of individual islands (which themselves are large volcanoes). Radiometric dating of volcanoes, from recently active to long extinct, confirms the predicted rate of plate motion based on modern observed values.
  86. Even if one rejects these dates, we must still account for the sheer size of the subaqueous mountain belts, which form gradually by periodic eruptions. It takes time for one deposit to cool and solidify, before another can be laid on top. Otherwise, a 33,500-foot shield volcano could not form, but only a relatively flat plateau of flood basalts on the seafloor.
  87. Extent of the Siberian Traps. Image from Wikimedia Commons.

    Extent of the Siberian Traps (blue line). Documented lava deposits shown in red; tuff in purple. Image from Wikimedia Commons.

    Volcanoes would have destroyed all life on Earth, assuming that volcanic deposits now preserved in the geologic column had to have formed during a single year. Massive eruptions have been well preserved, for example, in the Deccan traps (Siberia) or in flood basalts of the Snake River basin (northwestern U.S.). Geologists have modeled the impact of these individual lava flows on terrestrial and ocean life, and consistently conclude that each could have contributed to dramatic climate change and major extinction events. But these models assume that lava of the Deccan traps, for example, erupted over hundreds of thousands of years. Cumulatively—and if we require that all eruptions took place during the Flood year—these volcanic flows would have poisoned the oceans with heavy metals and saturated the atmosphere with carbon dioxide and sulfur gases. The sheer amount of carbon dioxide would have driven the oceans toward acidic conditions too vile for any surface life.

  88. Carbon dioxide emissions from volcanic events would have driven atmospheric concentrations to ~50,000 ppm or more. That’s more than 1,000 times what we find today! There is no evidence, however, for the extreme heating of Earth’s surface that inevitably would have ensued (on the contrary, YEC’s believe an ice age followed the Flood). Additionally, not enough time has passed since the Flood for such high levels to have equilibrated to those observed prior to the modern industrial age. The mass of volcanic deposits within the geologic column precludes the Flood geology model entirely.
  89. Large metamorphic bodies do not form rapidly, but require hundreds of thousands to millions of years worth of circulating waters under intense heat and pressure. The notion that catastrophic plate tectonics can explain the metamorphism of extensive mountain belts has no basis in physical science.
  90. Large sphalerite (zinc sulfide) crystals forming in ore body. Image from MGG&MS.

    Large sphalerite (zinc sulfide) crystals forming in ore body. Image from MGG&MS.

    Gemstones and other rare minerals form by slow accumulation of rare elements in magma or in water circulating through rocks. The greater the size, purity, and quality of gemstones, the longer it would have taken to form them. Gemstones are thus a testament to the antiquity of the Earth.

  91. Radiogenic isotopes in rocks from the crust to the deep mantle indicate a long history of chemical evolution deep within the Earth. As large igneous bodies cooled at the surface to create continental and oceanic crusts, some elements preferentially were incorporated into solid minerals, while others remained preferentially in the liquid mass in the mantle. This chemical differentiation explains very well the difference in isotope ratios between the crust and deep mantle rocks, assuming that it occurred over several billion years. Young-Earth geologists, on the other hand, cannot explain the most basic geochemical features of the Earth’s crust and mantle.
  92. Catastrophic plate tectonics is the only way to explain the bulk evidence for plate tectonic theory in a young-Earth timeline. But two major problems arise: excess heat and lack of a viable mechanism. Though YEC’s feel they have been able to model rapid subduction of the Earth’s crust (accounting for the mechanism), they certainly cannot explain how this process did not destroy the Earth’s surface in a giant heat death. Excess heat must have transferred to the oceans and the crust, which would destroyed all life on Earth.
  93. There is no evidence of excess heating from catastrophic plate tectonics. According to John Baumgardner, the excess heat diffused by evaporating a ~1.5-km-thick column of water over the oceans. He claims this is a answer to the ‘heat problem’ above, which he believes is physically “comprehensible”. But the geologic record shows no evidence of large scale heating of the oceans, such as might be expected in stable-isotope proxies that work as paleothermometers (such as δ18O and Mg/Ca in carbonates or δD in clay minerals).
  94. Cross section of oceanic crust at a mid-ocean ridge. Image from a lecture slide here.

    Cross section of oceanic crust at a mid-ocean ridge. Image from a lecture slide found here.

    Catastrophic plate tectonics cannot explain detailed formation of new oceanic crust, as is observed today at mid-ocean ridges. Oceanic crust is not a homogenous mass of basalt, but develops distinct textures from top to bottom, due to different cooling rates and chemical composition. If the ocean floor had to form rapidly (in a matter of years), we should not find these textures in older sections of oceanic crust, far away from modern spreading ridges.

  95. Seafloor basalt is modified geochemically by hydrothermal vents that form in fissures near mid-ocean ridges. These vents are powered by hot, upwelling seawater that originally infiltrated far away from the ridge, where temperatures are much cooler. However, the catastrophic plate tectonic model allows no time for this process and would have created a seafloor that was entirely too hot for effective hydrothermal circulation. Therefore, the catastrophic model is falsified by the thousands of studies of the ocean floor, which find evidence of alteration of seafloor basalts in very old parts of the crust (such as the western Pacific).
  96. Radiometric dating of seafloor basalt has produced a famously coherent pattern of increasing age away from mid-ocean ridges. The mapbelowis constructed by compiling thousands of analyses from dozensofindividual studies across the globe. Though young-Earth geologists will argueagainstthe validity of absolute ages, they still must explain the overall pattern, which makes no sense intheirparadigm (even invoking accelerated nuclear decay).

    Age distribution of the ocean floor; image and data compilation from NOAA.

    Age distribution of the ocean floor; image and data compilation from NOAA.

  97. The relative abundance of elements in the cosmos shows distinct patterns that make little sense in the young-Earth paradigm. For example, hydrogen and helium are super abundant compared to lithium, beryllium, and boron. Furthermore, elements of even atomic number are ~10 times more abundant than elements of odd atomic number. These relationships make sense in conventional astrophysics, because elements are produced over millions of years in dense stars through a process called nuclear synthesis. But YEC’s must explain them ad hoc:God simply created them like this.

    Relative abundance (on a logarithmic scale) of elements in our universe.

    Relative abundance (on a logarithmic scale) of elements in our universe.

  98. Components of our solar system, including the sun, meteorites, and planets, have approximately the same chemical composition (if volatile elements are excluded). This coincidence is shocking, unless we allow that each was drawn from a primordial mass, as described by the nebular hypothesis.
  99. Even the RATE team, a YEC think-tank seeking to undermine geochronology, has found no meaningful objection to the validity of radiometric dating techniques. Their proposal that radioactive decay rates increased by as much as a million times in the recent past is essentially a concession that geochronology works (they just refuse to accept the results), because…
  100. Accelerated nuclear decay is science fiction. Neither the physics nor the math produces a result in which radiometric dates yield consistently large ages for rocks and minerals in our solar system. One cannot tweak the physical properties of atoms, so as to increase the rate of radioactive decay, without all hell breaking loose—literally. Rates of decay depend on the stability of individual atoms, so if unstable atoms became more unstable, we’d expect stable atoms also to become very unstable, which would be the undoing of the physical universe as we know it. These are not conditions through which an Ark of humans and animals ever could have survived.

Why I do NOT “believe in Darwin’s theory of evolution”

File:Origin of Species title page.jpgFact not theory; 150 years on from Darwin’s watershed publication; evidence not belief. Words matter.

A recent Harris poll asked Americans “Do you believe in Darwin’s theory of evolution?” Others more eminent have commented on the answers; I would like to comment on the question.

Darwin, of course, never used the word “evolution,” but let that pass. As for the rest, it would be difficult to cram a larger number of serious errors into so small a space. Errors of presentation, of logic, and of scientific and historical fact, all of which play into the hands of our Creationist opponents.

Start with the obvious, the word “theory.” In common language a theory always involves speculation. In academic discourse, it means a coherent set of ideas that explain the facts. Calling something a theory in this sense tells you nothing at all about how certain it is. A theory can be wrong (phlogiston theory), known to be approximate from the outset (ideal gas theory), very close to the truth but since improved on (Newton’s theory of planetary motions), or as certain as human knowledge ever can be (number theory in mathematics). Of course you can explain all this, but you should not put yourself in such a vulnerable position in the first place. It wastes time in debate, or in the classroom. It puts you on the defensive, and thus, paradoxically, confers legitimacy on the attack. It allows the focus to shift from what we know about the world to the words we use to talk about it. This takes us away from science to the domain of the philosophers, lawyers, and expositors of Scripture who are fighting on behalf of Creationism.

And so it distracts from what you should be talking about, namely the facts. Evolution, whether we mean changes in the genetic make-up of populations over time, or the common descent of living things on earth, is a fact. It is supported by, and explains, innumerable more specific facts concerning the fossil record, molecular phylogeny (the same kind of evidence that is used every day in DNA paternity tests), the frozen-in historical accidents of organs that have lost or changed their function, the distribution of species throughout space and time, and much more besides. Creationism cannot explain these facts, except by appeal to the whims of the Creator.

Next “Darwin’s.” Darwin did indeed have a theory, as independently had Wallace, which was that different species had arisen gradually by natural selection operating on variation. This he supported by meticulous observation, but the range of evidence available to him was far more limited than what we have today. He lamented the poverty of the then known fossil record, laments that Creationists echo to this day as if nothing had changed. He knew nothing about mutations or even about the existence of specific genes, and so he had no idea how new variants could arise and spread. His assumption of gradualism is in contrast to later ideas such as punctuated equilibrium, and we now know that much if not indeed most variation arises through neutral drift. Thus not only do we know far more facts about evolution than Darwin could have dreamt of, but our theories, too, incorporate numerous additional concepts.

Finally, worst of all, “believe in.” Believing always carries with it the feeling that disbelief is an option. Some members of the jury believe the witness, others don’t. Some people believe that Hillary Clinton will be the next President of the United States, but no one would say they “believe” that Barak Obama is the current incumbent, because no sane person doubts it. I don’t “believe in” atoms, or gravity, or quantum mechanics, because I regard them as established beyond dispute, although our notions about them will no doubt continue to change as we learn more. And exactly the same is true of evolution.

Does it matter? Yes, it matters enormously. Creationists often maintain that evolution and Creation are both beliefs, whose respective advocates differ, not about observable facts, but about how those facts are to be interpreted. They obsess about Darwin, referring to evolution as “Darwinism,” and to those who accept this reality as “Darwinists.” The aim here is to bypass 150 years of experimental and intellectual discoveries, to bog us down in the day disputes of the late 19th century, or even (“Darwin’s doubt,” see here and here) to enlist Darwin himself as an unwitting ally.  And they contrast evolution, as “only” a theory, with facts or even with scientific laws, in order to claim that it is far from certain and that different views deserve a hearing.

Most people have not thought long and hard about evolution. And in the US at least, much of what they have heard about it will have come from its theologically motivated opponents. These opponents, whether through “statements of faith” that make obscurantism a virtue, or through “academic freedom bills” that disguise telling lies to children as open intellectual debate, use carefully crafted words to stake spurious claims to the moral high ground.

We should not, ourselves, be using words that help them do this.

Bears, whales, God, Darwin, and Peter Hitchens (Part I)

Can bears turn into whales? Peter Hitchens (PH) asks this question in two successive instalments of an anti-evolution tirade of the kind that gives ignorance a bad name. Normally I would not have bothered with such nonsense, especially since Jerry Coyne at WEIT has already dismembered what with PH passes for reasoning in greater detail than it deserves. However, PH does raise an interesting question or two, and makes one assertion is so breathtaking in its combination of arrogance and ignorance that I cannot forbear from discussing it. Let me deal with these matters in turn.

The first question is, can bears turn into whales? The suggestion is based on a remark by Darwin, in the first edition of On the Origin of Species, which he dropped it in later editions as being too speculative. However, PH still chooses, over 150 years later, to cite it as evidence that Darwin’s whole research programme, and by implication the entire structure of the life sciences as they have developed since that time, is really very silly. As to why we all indulge in such silliness, PH’s answer, which I will analyse later, is as ridiculous as it is insulting.

The answer to the question, by the way, is no. Of course, no presently existing species is capable of evolving into another presently existing species, any more than PH is capable of evolving into his late lamented brother, nor would Darwin ever have suggested such a thing. If we rephrase the question a little more precisely, do bears and whales share a relatively recent common ancestor, the answer is still no. Bears do in fact share a relatively recent ancestor with seals and walruses, but their last common ancestor with whales was back in the Cretaceous.

The obvious question then arising is this: if whales are not related to bears then what are they related to? Forty years ago, we didn’t have a precise answer to that question. Now we do, and PH could have found it easy enough, just by looking up whale evolution in Wikipedia. And while PH is understandably concerned about erroneous assignments, since the only fossil he seems to know about is the Piltdown forgery, Wikipedia will also provide him with a list of 43 separate extinct families of precursors of modern whales. But perhaps PH is a Wikipedia snob, or perhaps these articles, replete as they are with terms like “artiodactyl” and “cladogram”, are above his technical reading level. In the latter case, I would refer him to an excellent National Geographic article; in the former to either of two recent but more technical reviews, here and here. I will be writing about whale evolution at much greater length elsewhere, showing as it does a beautiful coming together of three separate lines of evidence; from the fossil record sequence, from anatomical homologies, and from molecular phylogeny.

My point here is a rather obvious one. PH admits that he is ignorant about evolution. Nothing to be ashamed of there. After all, he is a busy man, and has his own priorities, and if he can’t find the time to learn what kind of place the natural world is, and how we fit into it, then that’s his own business. But what he should be most deeply ashamed of, is his decision to write, not once but twice, about such a subject without first bothering to inform himself.

Despite his self-proclaimed ignorance, PH claims to have penetrated the motivation of the scientific community in its acceptance of what he describes, in rather simplistic and old-fashioned language, as “the theory of evolution by natural selection.” What he tells us of this theory is that the motivation is fundamentally theological, or rather, anti-theological. To quote, “I will re-state it, yet again. It is that I am quite prepared to accept that it may be true, though I should personally be sorry if it turned out to be so, as its implication is plainly atheistical, and if its truth could be proved, then the truth of atheism could be proved. I believe that is its purpose, and that it is silly to pretend otherwise.” [My emphasis]

So this is a clear statement of what PH considers to be the purpose of the theory; not to make sense of nature, as we scientists pretend, but to prove the truth of atheism. Well, questions of motivation are always interesting, if difficult to settle, but in this particular case we happen to be in a position to decide the truth or otherwise of PH’s claims. The theory of evolution by natural selection was first clearly formulated by two separate individuals, initially working independently, Alfred Russel Wallace and Charles Darwin. We know a great deal, in both cases, about their attitudes to religion, and Darwin in particular has left us a detailed description of how his views changed over time, as a result in large part of the evidence that he collected while developing and testing his theory. Both these great scientists changed their opinions on religious and spiritual matters during their working lives. Neither developed their theories in pursuit of a theological agenda, and if they had done so, that would have amounted to professional malpractice. The reality is very different, much more interesting than anything PH could have imagined, and we will return to this in the next part.

Nonsense from Nagel, and the myth of “common sense”

The appearance of Nagel’s assault on evolutionary science, Mind and Cosmos: Why the Materialist Neo-Darwinian Conception of Nature Is Almost Certainly False, from a position of self-confessed ignorance regarding the underlying science, prompts me to post what I wrote about his methods a few years ago (note BTW the giveaway description of 21st Century science by a mid-19th Century label):

Common sense or utter nonsense?

“Sophisticated members of the contemporary culture have been so thoroughly indoctrinated that they easily lose sight of the fact that evolutionary reductionism defies common sense. A theory that defies common sense can be true, but doubts about its truth should be suppressed only in the face of exceptionally strong evidence.” (Thomas Nagel, Philosophy & Public Affairs 36, 187-205, 2008; posted on FaceBook by Glasgow’s very own Centre for Intelligent Design)

It is difficult to see how one could cram a larger number of logical errors into so small a space.

We begin with an extraordinary smear on the writer’s opponents. The well-informed are labelled “sophisticated”, while to be convinced by the evidence is to be “indoctrinated”. And so, by a populist inversion, the near unanimity of informed opinion in support of evolution becomes an ad hominem argument against it. The suggestion that doubts are “suppressed” is another gratuitous smear, based on pretended ignorance of the robust reevaluation to which all scientific theories are continually exposed.

Reductionism is not defined in Nagel’s paper (in fact, the passage quoted is the only place where the concept is used), so I don’t know how he is using this notoriously slippery word, nor why purported explanations in terms of intelligent design (the proffered alternative) escape this fate, if indeed they do. However, it is worth pointing out that evolutionary explanations by their very nature describe the behaviour of systems, or even (if we restrict ourselves to the last billion years or so) of interlocking populations of systems, the very opposite of reductionism. I find it shocking that a philosopher of mind, of all people, should be unaware of this.

Worst of all is the appeal to common sense. Common sense is an amalgam of received and unquestioned wisdom, unexamined and often unconscious philosophical assumptions, and extrapolations from everyday experience. What appears to be in accord with common sense must depend on how much one already knows. Thus separate creation of kinds may appear to be in accord with common sense to someone who is completely ignorant of the richness of the fossil record, its relationship to the classification of modern organisms from Linnaeus onwards, the reappearance of the same Linnaean patterns in family trees based on molecular phylogeny, and the overwhelming evidence of the antiquity of the Earth. To someone familiar with these things, it will be the concept of separate creation that violates common sense.

Nagel does not tell us what he would regard as “exceptionally strong evidence”, just as he does not tell us what counts as “evolutionary reductionism”, but the evidence for evolution is presumably strong enough to persuade him to renew his annual flu jab. Since he is writing in a journal concerned with public affairs, it is also worth pointing out that it is strong enough to have led to changes in public policy on the use of antibiotics and pesticides, so as to avoid encouraging the (reductionist?) evolution of resistant strains.

However, the appeal to common sense is an intrinsically weak argument for other, much deeper, reasons. Common sense is an appeal to common experience. Much like the “intuition” discussed in Bertrand Russell’s essay, Mysticism and Logic, it is within the domain of common experience that it has the greatest credibility. Common sense tells us that we are standing still on solid ground, that animals and vegetables are different kinds, that space is Euclidean, that the heavens are unchanging, that an object will eventually come to rest if no force is acting on it, and that tables are solid. That the earth is moving, and that the continents themselves are moving across its surface, that a man shares half his genetic information with a mushroom, that matter distorts the space around it, that the universe is expanding, that a moving object will continue along its trajectory until something stops it, that matter is made up out of atoms and that almost all the mass of these atoms is crammed into a tiny nucleus less than one billionth of the total volume, all of these are violations of common sense. Nonetheless, they are fundamental facts of which any educated person should be aware, even at the cost of being described by Professor Nagel as “sophisticated” or, worse yet, “thoroughly indoctrinated”.

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