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