History of the Earth

Eons, Eras, Periods, and Epochs

History of the Earth

542 million years ago - present

2.5 Billion - 542 million years ago

4.0-2.5 Billion Years Ago

Archean

Hadean

4.6-4.0 Billion Years Ago

Proterozoic

Phanerozoic

.Timeline.

The Hadean Eon

This precambian time period was defined by the formation of rock through volcanic explosion and a molten surface.

.Hadean.

The Archean Eon

This eon began with an atmosphere of methane droplets followed by the rise of cyanobacteria which produced free oxygen through photosynthesis.

.Archean.

The Proterozoic Eon

The final precambrian eon where the earth's temperature dropped steaply and cells became more specialized leading to the first eukaryotic organisms.

.Proterozoic.

The Phanerozoic Eon

This eon saw an explosion of life leading to the world as we know it today. It is studied in three eras, twelve periods, and several epochs.

Cenozoic

Mesozoic

Paleozoic

.Phanerozoic Intro.

Cambrian-Ordovician-Silurian-Devonian-Carboniferous-Permian

The Paleozoic Era

This period saw creatures with exoskeletons like trilobites which followed by vascular plants and amphibians.

Cretaceous Period

Jurassic Period

Triassic Period

The Mesozoic Era

Quaternary

Neogene

Paleogene

The Cenozoic Era

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