Hadean (Hell, the Inferno) (jan 1, 1000000000 BC – jan 1, 1000000000 BC)

Description:

is the first and oldest of the four known geologic eons of Earth's history, starting with the planet's formation about 4.54 Bya

The eon's name "Hadean" comes from Hades, the Greek god of the underworld

The supposed interplanetary collision that created the Moon occurred early in this eon. The Hadean ended 4.031 billion years ago and was succeeded by the Archean eon, with the Late Heavy Bombardment hypothesized to have occurred at the Hadean-Archean boundary.

Hadean rocks are very rare, largely consisting of granular zircons from one locality (Jack Hills) in Western Australia.[6] Hadean geophysical models remain controversial among geologists: it appears that plate tectonics and the growth of continents may have started in the Hadean.[6] Earth in the early Hadean had a very thick carbon dioxide- and methane-rich prebiotic atmosphere, but eventually oceans made of liquid water were formed.

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