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Re:[Re:Sauropod ancestry]

To the best of my knowledge, most of the prosauropods (Plateosaurus,
Massospondylus, etc.) became extinct at the end of the Triassic Period
(about 230 million years ago). However, I have heard that supposedly
they found remains of prosauropods as late as the mid-jurassic, but none
in the cretaceous.

Hope this helps,