Category Archives: Geology

My “Islamic Foreshadowing of Evolution” has appeared in Muslim Heritage.

I am published in Muslim Heritage.

Islamic Foreshadowing of Evolution (full article here).

Gloriously illustrated by the Muslim Heritage editorial team; so much for the common impression that Islam forbids representational art.

Images assembled by Muslim Heritage editorial team

I briefly describe present-day evolution science, and why the evidence for this is considered overwhelming, having earned endorsements from national academies worldwide, including the academies of several predominantly Muslim countries.

I show how Muslim thinkers (especially Al Biruni and Ibn Sina) went beyond Aristotle’s mere assertion that the Earth is old (for Aristotle, infinitely old), by observing and discussing fossils and sediments in an unmistakably scientific manner. I also discuss widespread claims that Islamic scholars had anticipated modern evolutionary thought, and come to the sad conclusion that these are not warranted. What is being described, by sources as diverse as the poet Rumi, the Ikhwan al-SafaI (Brethren of Purity, 8 – 10 C CE), and the pioneer social scientist Ibn Khaldun in 1377 CE, is the Great Chain of Being, derived from Aristotelian thought, and represents stages of development, but does not imply common descent, or change over time. I also look at the claims made on behalf of al Tusi, but fear that these will not stand examination.

The one clear example that I do find of anticipation of the central ideas of mutability of species and common descent comes from al Jahiz’s delightful Kitab al-Hayawan (Book of Living Things, 9 C CE), where among much other interesting material (though the story of birds cleaning crocodiles’ teeth is, alas, suspect) he correctly suggests common ancestry for wolves, dogs, and foxes.

The Crocodile from The Book of Animals by Al-Jahiz Credit: © Veneranda Biblioteca Ambrosiana, Milan, Italy/Bridgeman Images, via PhotoEditor61

I would be delighted to hear of other examples, provided these are accompanied by links to reliable translations (I regret that I cannot read Arabic or Persian) of the original material. I am of course aware of a great deal of twentieth and twentyfirst century literature that makes such claims, but on examination I have so far found these to be simply back-projection. We must also remember that earlier thinkers must be judge in the context of their own times, that they were unaware of the significance that observations would require at a later stage, and that to judge them according to how well they happen to agree with us, with our vastly expanded knowledge base, is unhistorical and, indeed, patronising.

On the relationship between evolution and Islam, I have this to say:

It is not my place to discuss this. I will merely point out that debate between those who accept and those who reject evolution can be found within all the Abrahamic religions, with discussion hingeing on the ways in which the ancient sacred text should be interpreted by a modern reader (Marwa Elshakry, of Columbia University History Department gives a scholarly account1). There are those who protect traditional interpretations by rejecting evolution, but such rejection carries a high cost since it creates a conflict between faith and worldly knowledge. And there are those who attempt to evade this conflict by denying the plain scientific facts; here the cost is even higher. There was a recent vigorous discussion of these topics organized by the Deen Institute,2 and the scientific academies of Bangladesh, Egypt, Indonesia, Morocco, Pakistan, Palestine, Turkey and Uzbekistan have joined others worldwide in affirming evolution.3

On the Muslim Heritage Facebook page, my article has received over 2000 “likes”. I am grateful to the editorial staff of Muslim Heritage for inviting me to contribute this article, and to Ehab Abouheif, Jim Al-Khalili, Glenn Branch, J. E. Montgomery, Cem Nizamoglu, Rebecca Stott, and Douglas Theobald for helpful discussions.

I will be posting a fuller summary of my rather lengthy article in due course.

1] Marwa Elshakry, Reading Darwin in Arabic, 1860-1950, University of Chicago Press, 2013.

2] “Muslim leaders urge Islamic community to rethink evolution theory” by Omar Shahid

3] IAP on the Teaching of Evolution


Some of my geology photos

If there’s interest, I’ll post more. Click and select “View full size” (below image, R) for full resolution. I lack formal training in geology, and would greatly appreciate comments on my proposed interpretations, but find structures such as these, on every scale, at once fascinating and beautiful.

The Betic-Rif arc of Spain and North Africa is in the news, here are some things I saw in the area:

img_6161Left: schist exposure near Benalmadena, Western Malaga province. These Permian rocks have been metamorphosed at a depth of some 40 km. Recent exposure caused by westward extension of Benamadena promenade Read the rest of this entry

A Creationist Speaker Comes to Town

Long but detailed; updated resources include rebuttals to creationist claims, including dinosaur soft tissue, and teaching exercise on Lucy. I have mined this for links. There is also a discussion of bible-basd arguments, for those (like the author) to whom such things are important.

Letters to Creationists

By the early 1800s European geologists (many of them devout Christians) realized that the rock layers they observed had to be far older than the 6000 years allowed by a literal interpretation of Bible chronology. For instance, as discussed here , angular unconformities like that shown below could not been formed in the course of the one-year-long Flood of Noah.

Angular Unconformity at Siccar Point, Scotland. Siccar Point, Scotland (Photo: Wikipedia “Hutton’s Unconformity”) Angular Unconformity at Siccar Point, Scotland. Siccar Point, Scotland (Photo: Wikipedia “Hutton’s Unconformity”)

Numerous other evidences for an old earth have been observed by scientists over the past two hundred years. These include fossil soils, and massive deposits of salt and of limestone in the midst of sedimentary rock layers, and tens of thousands of annual layers in lake bottom deposits (“varves”) and in glaciers (see Some Simple Evidences for an Old Earth). We can trace, in reasonable detail, the movements of the sections of earth’s crust over the…

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Young Earth Creationists arguing in circles

Relative dating from sedimentology dates back some 200 years, as beautifully explained here by my friend, field geologist and Anglican priest, Michael Roberts, with illustrations from what he has seen himself, while we have now had absolute radiometric dates for over a century. Index fossils are used only to establish that rocks are the same age, and the way creationists manage to forget this fact is indeed miraculous.

This piece gains added interest because of its first-hand accounts, both of geological exploration, and of attempts to persuade creationists to accept the results.

Peddling and Scaling God and Darwin

This incredibly duplicitous meme appeared on my twitter feed today. Fri 13th Jan 2017icrevolution

Evolution is wrong as it is a circular argument from the age of fossils worked out from evolution

Yes, it is the old chestnut of Young Earthers that the age of rocks is based on a circular argument from evolution. It took me back to 1971 when I made the felicitous mistake of going to L’Abri to sit at the feet of the evangelical guru Francis Schaeffer. I arrived ther all bright-eyed and bushy tailed thinking of all the wondrous things I would learn in the next four weeks. I learnt much but not what I had expected.

On my first morning i was sent to Shaeffer’s son-in-law Udo Middlemann to discuss what I would study. I explained that I was going into the Anglican ministry and had just returned from 3 years working as an…

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Historical Science: How do We Know a Fish Fossil is a Fish Fossil?

Creationists argue that historical science is different from, and more uncertain than, present-day observational science. But their choice of examples shows that they themselves don’t really believe this.

Naturalis Historia

The difference between what young earth creationists like to term “operational” or “observational” science and historical science doesn’t have the sharp distinction they like to project to their audience.  I was reminded of this recently when I had an opportunity to hear Tommy Mitchell speak at a local Answers in Genesis conference a few weeks ago.  One particular talk was entitled:  Jurassic Prank:  A Dinosaur Tale.  In it Mitchell presents the young-earth case that dinosaurs lived with man as recently as a few thousand years ago.  The “tale” of course is that scientists have been telling us that dinosaurs died out millions of years before man existed.  You could say the punchline to the entire talk was that the public has been punked with regards to the truth about dinosaurs.

There are many lessons to be learned from this talk but I want to focus on one seemingly simple observation that Mitchell makes.  Below is a YouTube version…

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Is “The Imminent Demise of Evolution” still imminent?

The demise of evolution, and of the geology necessary to support it, has been imminent since 1825. I hear and tremble.

My friend the rev Michael Roberts has reblogged my link here, with reference to his own experience. Michael is Anglican Priest, geologist, and historian, and has been following Creationist infiltration into the UK churches  for some decades.

Troy Britain’s piece reblogged here refers in turn to G.R. Morton’s classical compilation. Morton’s piece was originally posted on Answers in Science. The link from Morton to Answers in Science failed to work for me, but I am happy to say  that a direct link, here, works admirably as a source and resource.

Playing Chess with Pigeons

Ten years ago, in 2006, intelligent design creationistWilliam Dembski predictedthat in a decade evolution would be toast:

LOUISVILLE, Ky. (AP) – To William Dembski, all the debate in this country over evolution won’t matter in a decade.

By then, he says, the theory of evolution put forth by Charles Darwin 150 years ago will be “dead.”

Yeah, well…

Meanwhile I stumbled uponthis today (dated 11-17-2016) from young Earth creationistRichard William Nelson:

Despite a flood of challenges since the publication of The Origin of Species in 1859 by Charles Darwin and more than 150 years of unprecedented scientific efforts in the history of mankind to prove otherwise, the evidence examined in nature tooled with unprecedented technology continues to be compatible with the Genesis record written by Moses…

…Evolution, once a theory in crisis, is now in crisis without even a cohesive unifying theory.

Biological evolution…

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Geology, evolution and Christianity in the 19th century

This by my friend the geologist, historian, and Anglican priest Michael Roberts, reminding us that the acceptance and active participation of clergymen and other believers in the emerging sciences of biology and evolution dates back more than three centuries.

Peddling and Scaling God and Darwin

If you read many historical studies of Britain in the 19th century, you will read that a major conflict was over science. That claim is overstated. Here is a brief overview.

 Geology (Deep Time) and Evolution?

From reading many books on church history, general history or popular science, it is easy conclude  that advances in geology in the eighteenth and early nineteenth centuries and then evolution after 1859 had gradually been undermining belief in God as Creator as well as an almost official literal reading of the early part of the book of Genesis. The actuality is rather different.


Genesis 1 from a 1611 copy of the KJV

So often the work of Archbishop James Ussher is cited as the “official” view of the churches. In 1656 he published his Annales Veteris Testamenti (Annals of the Old Testament) which gave the famous date of creation as 4004BC. (Actually, it has…

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Homage to Jack Chick, (April 13, 1924 – October 23, 2016); repost of How to lie about radiometric dating, evolution, and even nuclear physics

Now that he is dead, let us play Jack Chick the compliment of treating his ideas as seriously as we did when he was alive. I am sure he would not have wished otherwise.

And so, in his memory (he died on Sunday) I am reposting my analysis of one of his pieces that I found particularly interesting [update: Americans United for the Separation of Church and State have also reviewed his life and work, here]:

How to lie about radiometric dating, evolution, and even nuclear physics

Have you heard the one about the live snail with a carbon-14 age of 3000 years? Or the lava erupted in 1800 in Hawaii with a potassium-argon age in the millions? It’s all true, true I tell you. But does this signify a major problem with radiometric dating?

Spoiler: no.

I don’t know who first dug up these examples, but they were popularised by the creationist comic-book writer Jack Chick, in a publication called “Big Daddy”. The first page, available here, shows a well-primed creationist student arguing with a singularly ill-informed biology professor. The professor has been leading such a sheltered life that he’s never met these creationist arguments before. And he doesn’t understand anything about evolution or dating of rocks or embryology or indeed anything else. Surprise! the student wins! A skilled cartoonist, Jack Chick manages to squeeze the largest number of fallacies into the smallest number of words. There is a crib sheet at the end of this post, listing all the fallacies I spotted myself; I just reached double figures but there may be more.





Of course, it doesn’t help that the Professor doesn’t know anything about whale ancestors:


Or that the student is allowed to make the most absurd statements unchallenged, on the basis of a video by Kent Hovind:


But there’s more! At the end of page 1, which is also the end of your free sample I’m afraid, the student converts the Professor by pointing out that no one has ever actually seen gluons:



But fear not; an answer is at hand, in the very next frame:

So Jesus must be the force that holds the atomic nucleus together. Convinced by this reasoning, the Professor accepts Jesus, announces that as a result he can no longer teach evolution, and is sacked.

Jack Chick, by the way, has just published another comic book at the age of 92. In it, a bright young man from a good Christian (i.e. creationist) home is seduced by Satan into believing in evolution, and when we last see him is heading straight for damnation. In the words of one of Satan’s many horned helpers, “Joe trusted evolution, not God, and became a jobless party animal.” And a criminal and a drug addict, and covered himself with tattoos, and died and went to hell. Tragic, and so easily avoidable.

I never managed to get to Page 13 of Big Daddy, which is what we really need; link (if it works for you) here. It didn’t work for me, but you’ll find a description of the contents by someone called Honus at talkorigins, and I’ve seen some of the relevant cartoons reproduced elsewhere. So you can either take Honus’s and my word for it, or go online to Chick Publications and buy 25 copies (minimum purchase) of the tract, which I am not about to do.

The really remarkable thing about the tract is that it actually gives the primary literature references to the results that is discussing. And the briefest perusal of this primary literature will show why the papers that Chick refers to, far from undermining radiometric dating, actually reinforce it.

That snail was not 3000 years old, but that really was its apparent radiocarbon age, because it was exchanging calcium carbonate in its shell with mineral calcium carbonate. And that makes all the difference, so you need to take such features of the environment into account.

Many readers will be familiar with the principle of carbon-14 dating. Carbon-14 decays with a half-life of 5730 years. Nonetheless, the fraction of carbon-14 in the atmosphere stays roughly constant (or did before we started adding to it by nuclear weapons testing, and diluting it with carbon dioxide from fossil fuels). That is because the upper atmosphere is bombarded with cosmic rays, which cause nuclear reactions that convert nitrogen-14 (stable) to carbon-14. Mixing distributes this radiocarbon through the atmosphere, where it is taken up by plants and, in due course, animals. As long as you are alive, you are part of the circulating pool of carbon, but as soon as you die, the carbon-14 in your body starts decaying. Of course, cosmic ray intensity is not really constant over a long period, but we can calibrate carbon-14 dates by comparison with carbon in tree rings (dendrochronology). The tree ring correction is small for most purposes, but matters for things like precise dating of Egyptian dynasties.

The point, of course, is that the carbon in the lettuce being fed to the snails is part of the general pool, but the carbon in calcium carbonate minerals is radiochemically dead, having been out of circulation for a long time. What the paper really showed was that the snail exchanges carbonate in its shell with carbonate from dissolved minerals, giving a spurious depletion of radiocarbon in the snail. You will find the story in Science, 1963, p. 637 (paywall, sorry, but summary here).

What about these rocks in Hawaii? Here again the paper is behind a pay wall, but if you follow this link it will take you to the title and abstract, which is all you need. In fact, the title alone is all you need: “Radiogenic helium and argon in ultramafic inclusions from Hawaii”. Inclusions. And in case that’s not clear enough, the abstract tells you that the work is all about the dating of xenoliths. Xeno- foreign, as in xenophobia; lith rock, as in monolith. Look at the paper in more detail, if you can get access to it, and you will find that the excess argon is only found in bubbles of fluid within the rock, that bits of rock that aren’t bubbly don’t show any, and that there is circumstantial evidence that the argon comes from deep within the Earth’s mantle, not radioactive decay in the lava itself.

Anomalies happen all the time in geology. They are, in the original sense of the expression, exceptions that prove the rule; if there were no rule, we would not consider them exceptional. Uranium-lead and potassium-argon dates of rocks usually agree, but not if the rock has been so strongly heated that argon gas can escape. Whole rock dates can be misleading, as in the example of the Hawaiian volcano, if the rock has been contaminated from some source, in this case fluid from the mantle. So far from undermining the method, these anomalies add further information about the sample. In much the same way, radiocarbon dates will be anomalous if some of the carbon comes from inorganic sources, as in the case discussed above, and the anomaly might even be used to tell us something about the specimen’s history and diet.

Now here’s the bit that I really don’t understand. What is going on in Jack Chick’s mind, when he gives us this stuff? I assume that he is an honest person of goodwill, who is doing his best. He really believes that because I and most readers here accept the fact of evolution, we are going to be punished in hell for ever. Being a kindly man, he really doesn’t want that to happen, so he is doing his very best to convince us of the error of our ways.

So why does he do it by pointing us towards papers that say the very opposite of what he says they say? I can only speculate that this is the result of what psychologists call confirmation bias, which leads to interpreting new information, however perversely, in a way that supports what you already think. And when we come to creationism, the motivation for bias is extreme. Remember that we are talking about people who really believe (a) that if you don’t accept salvation through Jesus you are going to go to hell, and (b) that the doctrine of salvation through Jesus only makes sense if the biblical Fall is a historical fact. The papers I’ve mentioned above show that under certain rather special circumstances, radiometric dating will give you the wrong answer unless you take those circumstances into account. Young Earth creationists, knowing that their entire worldview depends on refuting radiometric dating, pounce on these examples as evidence that the method is unreliable. Which of course it is, if you don’t do it right. So what?

All of which gives me uncomfortable pause for two reasons. If creationists are so blinded by confirmation bias, what hope is there of reasoning with them? And if I see my intellectual opponents displaying confirmation bias, completely oblivious to what they are doing, what makes me think that I am any different?

h/t Sensuous Curmudgeon for tip-off about Jack Chick’s latest. Whale ancestors illustrated (Ambulocetus and Pakicetus) copyright JGM Thewissen; may be reproduced for non-commercial educational purposes.

IncredibleCrib sheet: Definition as obfuscation. Misdefinition of science to exclude all indirect inference (although even Young Earth creationists accept the fact of an Ice Age on geological evidence). Macroevolution, if the word means anything, means major change, and this takes more time than we have been watching. So of course we’ve never seen it. Similar fossils do indeed imply similar ages, but the order of these ages has been known for nearly 200 years on the basis of stratigraphy, and absolute ages established for over 100 years now by radiometric dating. Polystrate fossils were explained in 1868; the explanation is much the same today. New Scientist really did point out in 1997 that it is silly to carry on using Haeckel’s highly questionable drawings, as some still do, when we now have a much more detailed information. But, as explained in Alice Roberts’s Incredible Unlikeliness of Being and many other places, the gill folds on the human embryo really are homologous to the folds on that of a fish. They just develop rather differently, explaining such oddities as the tortuous path of our vagus nerves. As for the whale’s pelvis having “nothing to do with walking on land”, by 1999 we already had extensive series of fossils linking whales to their terrestrial ancestors; there is an excellent review here by one of the scientists involved in Evolution Education and Outreach (free download), and whales evolution also features in an excellent video here . The development of secondary functions (exaptation) is commonplace. Thus mammals’ ear bones are vestigial relics of reptiles’ rear jawbones. Creationists often argue, as here, that natural selection can only remove, and not add. This riddle was solved 120 years ago, with the discovery of mutation. Mutations supply novelty; selection winnows it. Creationists agree in explaining away pre-modern human fossils, such as Lucy and numerous others already known by 1999, as being either apes, or humans. Unfortunately, they can never agree on which is which. And, something that I think believers in particular should find offensive, the theological absurdities of the final frame.

This post originally appeared here in January, at

Why are some Christians Young Earth Creationists?

Young Earth Creationism is not just a belief, but proof of allegiance to a very special group, the Real Christians (or, I now fear, Real Jews or Real Muslims). Once a belief assumes this function, rational criticism is counter-effective.

(Of course you and I, dear reader, are not as others are, and would never allow our allegiances to shape our beliefs.)

Peddling and Scaling God and Darwin

It baffles many people whether Christian or not why some Christians are Young Earth Creationist, with a belief in a 10,000 year old earth and rejection of evolution. It cannot be denied that Young Earth Creationism has caused bad relationships among Christians, influenced education and results in much mockery from some. A major reason for the friction is that YEC’s claim explicitly or implicitly that the majority of Christians who accept modern science with the vast age of the earth and evolution are at best naughty or heretical Christians.

With YEC making inroads into churches (including the Church of England) and trying to call the shots over education in all parts of the world, it is best to know what they believe and why they do as they go against all scientific teaching and what most churches actually believe.


As YEC attracted so much more heat than…

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Darwin as a young man, watercolour by George Richmond, via Wikipedia

An excellent historical summary by my friend Michael Roberts, who has himself revisited the sites that Darwin explored in Wales. Darwin the geologist and Darwin the naturalist are inseparable.

Peddling and Scaling God and Darwin


Darwin concluded The Origin of Species with this magnificent paragraph;

It is interesting to contemplate an entangled bank, clothed with many plants of many kinds, with birds singing on the bushes, with various insects flitting about, and with worms crawling through the damp earth, and to reflect that these elaborately constructed forms, so different from each other, and dependent on each other in so complex a manner, have all been produced by laws acting around us. These laws, taken in the largest sense, being Growth with Reproduction; inheritance which is almost implied by reproduction; Variability from the indirect and direct action of the external conditions of life, and from use and disuse; a Ratio of Increase so high as to lead to a Struggle for Life, and as a consequence to Natural Selection, entailing Divergence of Character and the Extinction of less-improved forms…

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