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Precambrian is BEFORE the Cambrian period!
stromatolites
Precambrian Era.
The Archean Eon, which is part of the Precambrian period along with the Proterozoic Eon.
It is called a continental shield.
eras.
Precambrian is BEFORE the Cambrian period!
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Precambrian Era.
The atmosphere, during the Precambrian became richer in oxygen caused by a bacteria called cyanobacteria.
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