Chaotian (geology)
Proposed era of the Hadean eon
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Through Solar System, Dwarf planet and Year
A revised proposal in 2012 suggested the Chaotian as the first era of the Hadean representing the time between the formation of the Solar System c. 4.567 Ga and the oldest preserved crustal material on Earth, a detrital zircon c. 4.404 Ga from the Jack Hills of the Narryer terrane in Western Australia.
As of September 2023, neither proposal had been adopted or officially ratified by the International Union of Geological Sciences.
Subdivisions
The original proposal in 2010 divided the Chaotian into two eras and four periods. No numerical upper age limits were provided, only the younger age limit of ~4.5 Ga for the boundary between the proposed Chaotian and Hadean boundary.
The revised proposal in 2012 did not subdivide the proposed Chaotian era (of the Hadean eon) into periods.