Definition of Archeean
Ar*chæ"an (&?;), a. [Gr.
'archai^os ancient, fr. 'archh` beginning.]
Ancient; pertaining to the earliest period in geological
history.
Ar*chæ"an, n. (Geol.) The
earliest period in geological period, extending up to the Lower Silurian.
It includes an Azoic age, previous to the appearance of life, and an
Eozoic age, including the earliest forms of life.
&fist; This is equivalent to the formerly accepted term Azoic,
and to the Eozoic of Dawson.
- Webster's Unabridged Dictionary (1913)
- (geology) of, or relating to the geologic eon from about 3,800 to 2,500 million years ago; comprises the Eoarchean, Paleoarchean, Mesoarchean and Neoarchean eras; marked by an atmosphere with little oxygen, the formation of the first continents and oceans and the emergence of simple life
- (geology) the Archaean eon
- The Nuttall Encyclopedia
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