|
EON |
ERA |
PERIOD |
EPOCH |
DATES |
AGE of |
LIFE FORMS |
|
Phanerozoic |
Cenozoic |
Quaternary |
Holocene |
0 |
Mammals |
Humans |
|
|
|
Pleistocene |
|
2 |
|
Tertiary |
Neogene |
Pliocene |
|
5 |
|
Miocene |
|
24 |
|
Paleogene |
Oligocene |
|
37 |
|
Eocene |
|
58 |
|
Paleocene |
Extinction of dinosaurs |
|
66 |
|
Mesozoic |
Cretaceous |
Reptiles |
Flowering plants |
|
144 |
|
Jurassic |
1st birds/mammals |
|
208 |
|
Triassic |
First Dinosaurs |
|
245 |
|
Paleozoic |
Permian |
Amphibians |
End of trilobites |
|
286 |
|
Carboniferous |
Pennsylvanian |
First reptiles |
|
320 |
|
Mississippian |
Large primitive trees |
|
360 |
|
Devonian |
Fishes |
First amphibians |
|
408 |
|
Silurian |
First land plant fossils |
|
438 |
|
Ordovician |
Invertebrates |
First Fish |
|
505 |
|
Cambrian |
1st shells, trilobites dominant |
570
|
|
Proterozoic |
Also known as Precambrian |
|
1st Multicelled organisms |
2,500
|
|
Archean |
1st one-celled organisms |
|
3,800 |
|
Hadean |
Approx age of oldest rocks 3,800 |
4,600 |