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is a geologic eon, 4,000 to 2,500 million years ago (4 to 2.5 billion years),
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A division of the geological time scale, is the second geological period of the Neoproterozoic Era. It began about 720 million years ago and ended about 635 million years ago.
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A division of the geological time scale, is the third and last geological period of the Neoproterozoic Era.
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