How is our concept of earths first atmosphere related to the speed with which earth formed from the solar nebula?
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Answer:
Most geologists accept the assertion that the early Earth had a reducing atmosphere. The concept that the Archaean (> 2.3 billion Arbitrary Geologic Years (A.G.Yr.3) atmosphere contained practically no free oxygen has had its roots in the threefold division of the geological column based on abundance of macrofossils: Phanerozoic, Oroterozoic, and Archaean.
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