| EON |
ERA |
PERIOD |
EPOCH |
| Phanerozoic |
Cenozoic |
Quaternary |
Holocene |
| |
|
|
Pleistocene |
| |
|
Tertiary |
Pliocene |
| |
|
|
Miocene |
| |
|
|
Oligocene |
| |
|
|
Eocene |
| |
|
|
Paleocene |
---------------------------------------------------Cretaceous/Tertiary boundary 65 Ma--------------------------------------------------- |
| |
Mesozoic |
Cretaceous |
|
| |
|
Jurassic |
|
| |
|
Triassic |
|
----------------------------------------------------Permian/Triassic boundary 251 Ma---------------------------------------------------- |
| |
Paleozoic |
Permian |
|
| |
|
Carboniferous |
Pennsylvanian |
| |
|
|
Mississippian |
| |
|
Devonian |
|
| |
|
Silurian |
|
| |
|
Ordovician |
|
| |
|
Cambrian |
|
------------------------------------------------Precambrian/Cambrian boundary 542 Ma------------------------------------------------ |
| Proterozoic* |
|
|
|
------------------------------------------ Archean/Proterozoic boundary 2.5 Ga (= 2500 Ma)------------------------------------------ |
| Archean* |
|
[* The Archean + Proterozoic are informally known as "Precambrian"] |
-----------------------------------------Origin of the Earth, approx. 4.5 billion years (4.5 Ga)----------------------------------------- |
| |
| |
