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The Precambrian (or Pre-Cambrian) is the large span of time in Earth's history before the current Phanerozoic Eon, and is a Supereon divided into several eons of the geologic time scale. It spans ...
Dbpediathing
The Archean Eon (/ɑrˈkiːən/, also spelled Archaean; formerly Archaeozoic /ɑrkiːəˈzoʊɪk/), also spelled Archeozoic or Archæozoic) is a geologic eon before the Proterozoic Eon, before 2.5 Ga (billion ye ...
Dbpediathing
The Proterozoic /ˌproʊtərɵˈzoʊ.ɨk/ is a geological eon representing the time just before the proliferation of complex life on Earth. The name Proterozoic comes from Greek and means "earlier life& ...
Wikipedia Article
The Phanerozoic (British English Phanærozoic) /?fæn?r?'zo??k/ is the current geologic eon in the geologic timescale, and the one during which abundant animal life has existed. It covers roughly 542 mi ...
Dbpediathing
A geologic age is a subdivision of geologic time that divides an Epoch into smaller parts. A succession of rock strata laid down in a single age on the geologic timescale is a Stage.
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