Hundreds of vendors from dozens of countries converged in Tucson, Arizona, for the annual Gem and Mineral Show, where the ...

Dinosaurs long dominated Earth's land ecosystems with a multitude of forms including plant-eating giants like Argentinosaurus, meat-eating brutes like Tyrannosaurus and weirdos like Therizinosaurus, ...

Dinosaurs evolved from more primitive reptiles in the aftermath of Earth’s biggest mass-extinction event caused by extreme volcanism at the end of the Permian Period about 252 million years ago.

O’Connor is a dinosaur paleobiologist and the associate curator of fossil reptiles at the Field Museum of Chicago ... around 65 million years ago (not to be confused with the Permian-Triassic mass ...

Researchers identified the track as belonging to a prehistoric reptile from the Permian period, a time long before the age of dinosaurs. This era was teeming with diverse life forms, including ...

That agenda is unwelcome news for a small lizard in West Texas. The dunes sagebrush lizard — a tan, scaly reptile measuring ...

The Permian period was long before the age of dinosaurs—it started almost 300 million years ago. Animals called synapsids lived on the planet. They looked like a mix between reptiles and mammals—some ...