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

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 ...

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 ...

The 1.5 million acre Lake Mead National Recreation Area covers “mountains, canyons, valleys and two vast lakes,” the National Park Service says. National Park Service photo Imagine an ear falling off ...

A fossil from a seagull-sized winged reptile that lived millions of years ago was found in Arizona, and the creature has now been identified as a new species. The new type of pterosaur, named ...