Reblog of geologictimepics post, “Conglomerate”. Compare the same author’s “Rockin’ Countertops”, which I reblogged earlier as “The amazing geology of a ‘granite’ kitchen countertop”. In both cases, generation after generation of rock formation; time made visible.
A trip to Death Valley over Thanksgiving two weeks ago reignited all sorts of things in my brain, one of which being my love of conglomerate. Honestly, conglomerate HAS to be the coolest rock!
Tilted conglomerate in Furnace Creek Wash, Death Valley.
Just look at this stuff! Just like any good clastic sedimentary rock, it consists of particles of older rock–but with conglomerate, you can easily see those particles. Each of those particles opens a different door to experiencing deep geologic time.
As an example, look at the conglomerate below, from the Kootenai Formation of SW Montana. It contains many different cobbles of light gray and dark gray quartzite and pebbles of black chert. The quartzite came the Quadrant Formation and chert from the Phosphoria Formation. So just at first glance, you can see that this conglomerate in the Kootenai contains actual pieces of two other older rock units.
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