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 ...

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 ...

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 ...