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.

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 ...

If you thought that crocodiles were menacing enough, be glad that you didn’t live in Arizona some 225–201 million years ...

Kay Behrensmeyer, curator of vertebrate paleontology at the Smithsonian’s National Museum of Natural History, is shown in Arizona’s Petrified Forest National Park. Photo by Ben Kligman A fossil from a ...

Researchers have unearthed the oldest pterosaur ever discovered in North America and named it the "ash-winged dawn goddess." The 209 million-year-old pterosaur was among a cache of more than 1,000 ...

Scientists discovered a crocodile relative that is 200 million years old and had two legs. The diversity of reptiles during the Triassic period is shown by this discovery, which is long before ...