Proterozoic eon

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Related to Proterozoic eon: Hadean eon, Archean eon, Paleozoic era, Phanerozoic eon

Proterozoic eon:

see PrecambrianPrecambrian,
name of a major division of geologic time (see Geologic Timescale, table), from c.5 billion to 570 million years ago. It is now usually divided into the Archean and Proterozoic eons. Precambrian time includes 80% of the earth's history.
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The Last Eukaryotic Common Ancestor (LECA): acquisition of cytoskeletal motility from aerotolerant spirochetes in the Proterozoic eon.
The researchers arrived at these conclusions about oxygen by way of studying carbon in rocks from Earth's Proterozoic eon, which ran from 2.
Isotopic evolution of the biogeochemical carbon cycle during the Proterozoic Eon.