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ParkWise
> Teachers >
Nature >
Fossils > Unit Outline
Activity
2:
When Did They First Appear?
The Progression of Life
on Earth
|
ERA |
PERIOD |
MYA* |
WHEN THEY FIRST APPEARED |
|
Cenozoic Era
Age
of Recent Life or
The Age of Mammals |
Quaternary |
0.01
|
|
|
Tertiary |
5 |
|
|
Mesozoic Era
Age
of Medieval Life
(Time of the Ruling Reptiles) |
Cretaceous |
145 |
|
|
Jurassic |
200 |
|
|
Triassic |
250 |
|
|
Paleozoic Era
Age
of Ancient Life |
Permian |
295 |
|
|
Carboniferous |
362 |
|
|
Devonian |
418 |
|
|
Silurian |
439 |
|
|
Ordovician |
490 |
|
|
Cambrian |
543 |
|
|
Precambrian Era
(Time before Life) |
|
2500 –
4600 |
|
|
