The Length of the Proterozoic
The Length of the Proterozoic. the Proterozoic Eon alone, at 1.955 billion years long, accounts for 42.5% of all geologic time yet we review this long episode of Earth and life history in a single section . The Phanerozoic. Yet the Phanerozoic, consisting of Paleozoic, Mesozoic,
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