Hypernym

period 4

noun

a unit of geological time during which a system of rocks formed

Part_meronym

Cenozoic 1

noun

approximately the last 63 million years

Oligocene 1

noun

from 40 million to 25 million years ago; appearance of sabertoothed cats

Eocene 1

noun

from 58 million to 40 million years ago; presence of modern mammals

Paleocene 1

noun

from 63 million to 58 million years ago; appearance of birds and earliest mammals

Palaeogene 1

noundomain: time

EnWordnet [ver.5.0]

English

Definition

The Paleogene (also spelled Palaeogene or Palæogene; informally Lower Tertiary) is a geologic period that began 66 and ended 23.03 million years ago and comprises the first part of the Cenozoic Era.

Examples

1.Lasting 43 million years, the Paleogene is most notable as being the time in which mammals evolved from relatively small, simple forms into a large group of diverse animals in the wake of the Cretaceous–Paleogene extinction event that ended the preceding Cretaceous Period.