Blog Post Image: Fossil indicates hairy, squirrel-sized creature was not quite a mammal

Megaconus mammaliaformis is preserved as a slab (left) and a counter-slab (right) of shale deposited in a shallow lake. Megaconus is the first skeletal fossil of a mammaliaform group otherwise only known by their teeth, but with a long history extending back to the Late Triassic period. Photo by University of Chicago, Zhe-Xi Luo

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