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1 A system of the Proterozoic, extending from about 2500 to 1400 Ma ago (Int. Commission on Stratigraphy, 2004) and containing three glacial cycles.

2 A Lower–Middle Proterozoic stage, extending from about 2 600 to 1 500 Ma ago (Van Eysinga, 1975).

Subjects: Earth Sciences and Geography.

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