The Proterozoic ( ) is the third of the four geologic eons of Earth's history, spanning the time interval from to Ma, and is the longest eon of Earth's geologic time scale. It is preceded by the Archean and followed by the Phanerozoic, and is the most recent part of the Precambrian "supereon".
The Proterozoic is the longest division of Earth's history, lasting roughly two billion years and occurring between the Archean and Phanerozoic eons. It matters because understanding this vast span of time helps scientists piece together the deep history of Earth before the emergence of most visible life forms that characterize the Phanerozoic eon.
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The Proterozoic ( ) is the third of the four geologic eons of Earth's history, spanning the time interval from to Ma, and is the longest eon of Earth's geologic time scale. It is preceded by the Archean and followed by the Phanerozoic, and is the most recent part of the Precambrian "supereon".
The Proterozoic is subdivided into three geologic eras (from oldest to youngest): the Paleoproterozoic, Mesoproterozoic and Neoproterozoic. It covers the time from the appearance of free oxygen in Earth's atmosphere to just before the proliferation of complex life on the Earth during the Cambrian Explosion. The name Proterozoic combines two words of Greek origin: meaning "former, earlier", and , meaning "of life".
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