Geologic Time Scale

Camels often sit down carefully; perhaps their joints creak, tendons quake! (Periods)

Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous, Tertiary, Quaternary

Possibly early oversight might prevent permanent harm. (Epochs)

Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, Holocene

HAPP (Eons)

Hadean, Archaean, Proterozoic, Phanerozoic.

PMC (Eras)

Paleozoic, Mesozoic, Cenozoic

0-0.01 mya.

Holocene

1.8 mya. Genus Homo, language.

Pleistocene

5.2 mya.

Pliocene

65 mya.

Paleocene

206 mya. First birds.

Jurassic

251 mya. First fossil mammals.

Triassic

First reptiles.

Permian

353.7 mya.

Carboniferous

First vertebrate tetrapod (an amphibian).

Devonian

543 mya. Radiation of jawless fishes. Most animal phyla present.

Cambrian

2500 mya. First land plants and fungi.

Proterozoic

3600 mya. Origin of Life.

Archaean

4600 mya.

Hadean