|
|
Geologic
Periods
|
Era |
Period |
Epoch |
M Years Ago |
Pre-Cambrian |
Archean Eon |
|
4,600
|
|
Proterozoic
Eon |
|
2,500 |
|
Paleozoic |
Cambrian |
|
590 |
|
Ordovician |
|
505 |
|
Silurian |
|
438 |
|
Devonian |
|
408 |
|
Carboniferous |
Mississipian |
360 |
Pennsylvanian |
320 |
|
Permian |
|
286 |
|
Mesozoic |
Triassic |
|
248 |
|
Jurassic |
|
213 |
Cretaceous |
|
144 |
Cenozoic |
Tertiary |
Paleocene |
65 |
Eocene |
55 |
Oligocene |
38 |
Miocene |
25 |
Pliocene |
5 |
Quaternary |
Pleistocene |
2 |
Holocene (Recent) |
0.01 |
 |
Sources
Dixon, D., B. Cox et al. The Macmillan Illustrated Encyclopedia
of Dinosaurs & Prehistoric Animals. New York: Collier Books,
1992. |
|
