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

Learn how fossils from Arizona’s Petrified Forest National Park revealed that a Late Triassic crocodile relative may have started life on four legs before walking on two as an adult.

The poodle-sized reptile that lived over 200 million years ago was among creatures that had features similar to dinosaurs it ...

Fossils reveal a small ancient reptile related to crocodiles, Sonselasuchus cedrus, that may have switched from four legs to two as it grew.

A "peculiar" ancient relative of the crocodile which experts believe began life on four legs before, in adulthood, it learned ...

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 ...

In the U.S., many states have an official state fossil, or even a designated state dinosaur. Some states recognize an official dinosaur in celebration of the specific region's paleontology, and others ...

This is a new field trip to a sand pit near Shoofly that contains small fossils and petrified wood from ancient Lake ...