The name of the park gives it away: Most of the fossils you'll see at Petrified Forest are of exquisite petrified wood from the Triassic period over 200 million years ago.

The Lehi Hutchings Museum will add 25,000 fossils to its collection–a half-million dollar gift from a Utah man who spent his life collecting the specimens. The donation from Lloyd Gunther is the ...

SALT LAKE CITY — A newly discovered batch of well-preserved dinosaur bones, petrified trees and even freshwater clams in southeastern Utah may provide fresh clues about life in the region some ...

Want to look for fossils or dinosaur tracks in Arizona? Here's where to spot them in Grand Canyon and Petrified Forest and on the Navajo Reservation.

The Petrified Forest National Park in northeastern Arizona is well-known for the ongoing theft of petrified wood, even spurring a 2014 book called about people who feel guilty and return the fossils.

Petrified wood is a familiar example of fossilization—pieces of tree trunks turn into super-hard rocks, but still retain growth rings and even cell structures of the once-living tree.

A group of researchers in Utah discovered rare fossils of herbivorous mammal relatives that lived in the area about 180 million years ago, according to the National Park Service. The ...

The name of the park gives it away: Most of the fossils you'll see at Petrified Forest are of exquisite petrified wood from the Triassic period over 200 million years ago.