| Period |
Age |
Major Events |
| Holocene |
Now - 0.01 Myr |
Modern Man
|
| Pleistocene |
0.01 - 2 Myr |
Ice Age
|
| Pliocene |
2 - 6 Myr |
Horses
Primitive Elephants
|
| Miocene |
6 - 26 Myr |
First True Whales
Primitive Hominids
Giant Sharks
|
| Oligocene |
26 - 36 Myr |
Primitive Whales
|
| Eocene |
36 - 58 Myr |
Primitive Horses
Oreodonts
|
| Paleocene |
58 - 65 Myr |
Mammals Abundant
|
| Cretaceous |
65 - 135 Myr |
Last Dinosaurs
Flowering Plants
|
| Jurassic |
135 - 190 Myr |
Dinosaurs
Conifers
|
| Triassic |
190 - 225 Myr |
First Dinosaurs
Primitive Mammals
|
| Permian |
225 - 280 Myr |
Mammal Like Reptiles
Reptiles
|
| Pennsylvanian |
280 - 310 Myr |
Primitive Reptiles
Coal Swamps
Insects
|
| Mississippian |
310 - 345 Myr |
Amphibians
Crinoids
|
| Devonian |
345 - 400 Myr |
Shark Like Fish
Armored Fish
|
| Silurian |
400 - 430 Myr |
Primitive Land Plants
Eurypterids
|
| Ordovician |
430 - 500 Myr |
Primitive Fish
Corals
|
| Cambrian |
500 - 570 Myr |
Trilobites
|
| PreCambrain |
570 - 4500 Myr |
Primitive Marine Animals
Green Algae
4500 Myr - Age Of Earth
|
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