History of the Earth - Hm

History of the Earth

Eons, Eras, Periods, and Epochs

Proterozoic

Hadean

2.5 Billion - 542 million years ago

4.6-4.0 Billion Years Ago

.Timeline.

Phanerozoic

Archean

542 million years ago - present

4.0-2.5 Billion Years Ago

The Hadean Eon

.Hadean.

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

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.

.Phanerozoic Intro.

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

The Paleozoic Era

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

Cambrian-Ordovician-Silurian-Devonian-Carboniferous-Permian

The Mesozoic Era

Triassic Period

Jurassic Period

Cretaceous Period

The Cenozoic Era

Paleogene

Neogene

Quaternary

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