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"cave environments are well suited for fossilization of bones and coprolites [or fossilized feces] and the fossil record of cave mammals includes rodents, ungulates, marsupials, ursids, felids, hyaenids, canids, primates and humans," they wrote — all species with plenty of bones and poop. they added
according to a news article on phys.org , were likely descendants of a common ancestor from earlier in the cretaceous, before continental drift separated their homes on the supercontinent gondwana. it's not clear, the researchers noted, how the roaches ended up so well preserved. amber fossils are common for...
https://www.livescience.com/oldest-cave-dwelling-animal-cockroaches.html