Definisjon av archean

Vi fant 3 definisjoner av archean på engelsk.

WordNet

Noun
Archean - the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
		Archean eon, Archean aeon, Archeozoic, Archaeozoic, Archeozoic eon, Archaeozoic aeon
		precambrian, precambrian aeon, precambrian eon precambrian period
Adjective
archean - of or relating to the earliest known rocks formed during the Precambrian Eon
		archaean
		early at or near the beginning of a period of time or course of events or before the usual or expected time; "early morning"; "an early warning"; "early diagnosis"; "an early death"; "took early retirement"; "an early spring"; "early varieties of peas and tomatoes mature before most standard varieties"
		geology a science that deals with the history of the earth as recorded in rocks

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The Archean (also spelled Archaean, formerly called the Archaeozoic, also spelled Archeozoic or Archæozoic) is a geologic eon before the Paleoproterozoic Era of the Proterozoic Eon, before 2.5 Ga (billion years ago, or 2,500). Instead of being based on stratigraphy, this date is defined chronometrically. The lower boundary (starting point) has not been officially recognized by the International Commission on Stratigraphy, but it is usually set to 3.8 Ga, at the end of the Hadean Eon.

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