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 ...

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 ...

These ancient crustaceans are meager in size but mighty in history. A colony of prehistoric triops, a tadpole shrimp that’s existed for hundreds of millions of years, was beautifully captured by ...

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.

Credit: Abraham Karam A man jumps from a cliff into a pool in Fossil Creek as others look on. Dexter Allen, a Fossil Creek patrol ranger, cleans trash from a firepit after a big weekend. Deep in ...

PHOENIX — Fossil Creek in central Arizona is reopening to the public after a wildfire forced a closure for nearly a year-and-a-half. All sites, including the Childs Dispersed Camping Area, will reopen ...