A 60-million-year-old fossil initially speculated to be either a Cretaceous metatherian or an Eocene metatherian turned out ...

The first first primates in North America date back about 56 million years at the beginning of the Eocene Epoch. Scientists believe that the primates like Ekgmowechashala generally flourished on ...

To wit, by the start of the Eocene epoch about 56 million years ago, North America was also home to omomyiforms, a group of tarsier-like primates, and adapiforms, which were more lemur like. And ...

The first primates came to North America about 56 million years ago at the beginning of the Eocene, and they flourished on this continent for more than 20 million years.

During the Eocene, lasting from 56 to 33.9 million years ago, ... In North America, there were two main families of these primates: the omomyids and the adapids.

The fiercest apex predators in Eocene North America were the hyaenodonts-- bigger, stronger carnivores, which we've talked about before. Hyaenodonts had big, powerful jaws filled with blade-like ...

Paleontologists have known about North America’s giant prehistoric birds since the late 19th century. ... Yet, in Eocene strata, the most likely candidate we know of is Diatryma.