Gazing across the Painted Desert of northern Arizona today, it's hard to believe that 200 million years ago the region was a primeval tropical forest watered by abundant streams and inhabited by a ...

Where some visitors see unparalleled natural beauty, others feel "underwhelmed" at an Arizona spot named among most disappointing national parks.

To the east of Holbrook, just off the I-40, is one of the most otherworldly parks to visit in Arizona. Petrified Forest National Park, known for its striated badlands and its Rainbow Forest filled ...

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 ...

To the surprise of many, the great naturalist John Muir spent a year exploring the Petrified Forest in eastern Arizona.

A Smithsonian-led team of researchers have discovered North America's oldest known pterosaur, the winged reptiles that lived alongside dinosaurs and were the first vertebrates to evolve powered flight ...

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.

The newly described pterosaur Eotephradactylus mcintireae is seen eating an ancient ray-finned fish alongside an early species of turtle and an early frog species, with the skeleton of an armored ...