Dorudon atrox jurásico Fossils found in northeast China's

Fossils found in northeast China's Liaoning province show feather impressions preserved in the surrounding rock and on the dinosaur's own skeleton

lo que sugiere que eran animales muy agresivos y luchaban frecuentemente entre sí

específicamente en áreas que actualmente corresponden a los Estados Unidos

ammonites are extinct and are only known through their fossils

It's like we're there

Dorudon atrox jurásico Fossils found in northeast China'sDorudon atrox is an extinct species of cetacean mammal that belongs to the Basilosauridae group. Cetaceans are a group of marine mammals that includes whales, dolphins, and porpoises. The Basilosauridae are a family of archaic cetaceans that lived during the Eocene, approximately 40 to 35 million years ago. The name "Dorudon" comes from the Greek term "dory" which means spear, and "odon" which means tooth, referring to the sharp teeth it possessed.