In the geologic record the Chaotian eon (named after Chaos, the primeval void in Greek mythology) is unofficially proposed to denote the time preceding the solidification of the Earth's crust and the formation of Earth's moon. As proposed, it precedes the Hadean eon and is the earliest eon in Earth's history as a planet.
The NASA proposal divides the Chaotian into the Eochaotian and Neochaotian eras, which are in turn proposed to be divided into the Nephelean and Erebrean, and Hyperitian and Titanomachean periods, respectively.
- Fox, Stuart (January 7, 2010). "NASA Scientists Classify the Time Before Earth Existed: the Chaotian Era". Popular Science. Retrieved 30 July 2013.
- Goldblatt, C.; Zahnle, K.J.; Sleep, N.H.; Nisbet, E.G. (2 February 2010). "The Eons of Chaos and Hades" (PDF). Solid Earth.
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