https://gcmd.earthdata.nasa.gov/kms/concept/afd62c36-fd25-4673-a56d-85be8d47f3d0
broader |
|
|||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
change note |
|
|||||||||||||||||||||
definition | The Eocene is the second of five epochs in the Tertiary Period — the second of three epochs in the Paleogene — and lasted from about 55.8 to 33.9 million years ago. The oldest known fossils of most of the modern orders of mammals appear in a brief period during the early Eocene and all were small, under 10 kg. Both groups of modern ungulates, Artiodactyla and Perissodactyla, became prevalent mammals at this time, due to a major radiation between Europe and North America. | |||||||||||||||||||||
narrower |
|
|||||||||||||||||||||
reference |
|
|||||||||||||||||||||
type |
|
|||||||||||||||||||||
in scheme | chronounits original |