3 min read At the dawn of the Paleogene—the beginning of the Cenozoic era—dinosaurs, pterosaurs, and giant marine reptiles were conspicuously absent from the face of the Earth. Rodent-size ...

Fossil skull of the extinct cynodont therapsid Cynognathus crateronotus. Cynognathus was a powerful predator that was close to being a mammal, but not quite. It has been found in several parts of ...

Early contributors to the collection include John Clark (1936-1938), Robert W. Wilson (1938-1946), and Harold Koerner (1946-1971), who helped expand the collection of Cenozoic mammals. Clark’s primary ...