A fault bend fold, which is what you are looking at in cross section, often contains duplexes. Duplex is a collective term for rocks that are bound by faults on all sides. And what is a single block of rock bounded by faults called? A horse. I’m not kidding.
Disclaimer: The differently colored units are technically discrete strata, not thrust faults or horses, but it made the most sense to use them to represent the ponies. In addition, I wasn’t very rigorous in maintaining the same thickness through each layer of strata, which if I were drawing this for an exam or during field work I should have.
wait they…. must have started to grow from their fingers at some stage… would this be in dromaeosaurs? and theropods more geared towards flight? and ones that wouldn’t have evolved further towards flight may have just had them on their forearms/wrists?? ??? i’m being so dumb
We know at least oviraptorosaurs and paravians had wing feathers on their hands (Caudipteryx zoui and juvenile Similicaudipteryx, in fact, had long wing feathers only on their hands).
We don’t know what the case was with more basal coelurosaurs. There is evidence that ornithomimosaurs already had feathers forming a wing arrangement, but we don’t know what was going on with their hands. However, there is no evidence any coelurosaurs had unfeathered hands, so for now I would assume that the wing included the hands even in their early evolution.
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Lame geology joke is lame, but so exploitable.
For those who don’t get it, have an explanation.