Footprint Fossils Offer Earliest Evidence of Dinosaurs’ Ancestors

The tracks, described in a report published Wednesday by the journal Proceedings of the Royal Society B, push back the first appearance of this dinosaur lineage to about 250 million years ago.

“They are the oldest fossils of the dinosaur lineage of any type anywhere in the world,” said Stephen Brusatte, a graduate student at Columbia University and lead author of the journal article.

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