Fossils of drepanosauromorphs, a clade of non-saurian diapsids, were once considered relatively rare in the Chinle Formation of the southwestern United States as well as in Upper Triassic rocks ...

One of the world’s most “dramatic” examples of a petrified Triassic-era tree has lost “its battle against gravity” and collapsed, according to the Petrified Forest National Park in Arizona. Known as ...

Boulder, CO, USA - Research topics in the latest GSA BULLETIN posting include: the study of paleo-hurricane records from South Carolina marshlands; geochronology of the Chinle Formation that provides ...

Forward [sic] / William G. Parker, David D. Gillette, and Randall B. Irmis -- Dedication to Sidney R. Ash, Ph.D. / David D. Gillette and William G. Parker -- On the shoulders of giants : influential ...

The classic dinosaur family tree has two subdivisions of early dinosaurs at its base: the Ornithischians, or bird-hipped dinosaurs, which include the later Triceratops and Stegosaurus; and the ...

When Chase Pipes starts digging up history, more often than not he’s literally shoveling dirt. “We drove two and half hours down a rough dirt road and lived on-site for 15 days, hauling all of our ...

The Martin Lockley Fossil Track Collection contains over 3,000 cataloged specimens. Most of the collection was collected from the Rocky Mountain Region, with extensive collections of Pennsylvanian ...

“Onyx Bridge is a dramatic example of petrified wood” found in a layer of rock that dates back 210 million years, the National Park Service reports. National Park Service photo One of the world’s most ...

Geological evidence suggests the known dinosaur groups diverged early on, supporting the traditional dinosaur family tree. The classic dinosaur family tree has two subdivisions of early dinosaurs at ...