WASHINGTON (Reuters) -Scientists have unearthed in Arizona fossils from an assemblage of animals, including North America's oldest-known flying reptile, that reveal a time of transition when venerable ...

Tucked away in a remote bonebed in Arizona's Petrified Forest National Park laid hundreds of fossils, including a fragile jawbone belonging to one of the oldest-known flying reptiles: the pterosaur.

A set of fossilized footprints discovered in northern Arizona has revealed the silent journey of a prehistoric arachnid that ...

Can a skeleton be a storyteller? When it comes to dinosaur bones, the answer is yes — if you know how to listen! Prehistoric fossils are a wealth of critical scientific information. Everything from ...

PHOENIX — Fossils from the Petrified Forest National Park, in northern Arizona, revealed a new reptile species that thrived during the Triassic Period. Paleontologists and partners with the ...

Tyrannosaurus rex (pictured in a 3D illustration of a fossil skeleton) had the strongest bite of any known land animal, extinct or alive. Credit: Shutterstock Scientists have announced the discovery ...