It is thought to have separated around 35 million years ago in the late Eocene.

The formation has subsequently been determined to be late Eocene in age.

Taken as a whole, the fossils present an unusually detailed view of plants and animals since the late Eocene.

This fauna has been dated to about 33 to 35 million years ago, during the Late Eocene.

However, this "super-greenhouse" soon became an icehouse by the late Eocene.

It lived in Peru during the Late Eocene, around 36 million years ago.

The last surviving tillodonts lived in China and disappeared during the late Eocene.

Eochelone is an extinct genus of sea turtle from the late Eocene.

Eosiren is an extinct genus of sea cow that lived during the late Eocene.

Heterohyus is an extinct genus of apatemyid from the early to late Eocene.