"What's significant is that [the Atreipus-Grallator] track comes from rock that is at least 234 million years old, so four or more million years older than Ahvaytum. This suggests early dinosaur ...

Paleontologists at the University of Wisconsin-Madison determined a fossil found in 2013 is a new species of dinosaur, the earliest-known dino in the norhtern hemisphere.

Dinosaur fossils discovered by paleontologists working with the University of Wisconsin-Madison have been determined to be the oldest-known fossils, presenting evidence that the species was in ...