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並前往https://opentextbc.ca/geology/chapter/16-1-glacial-periods-in-earths-history/

16.1 Glacial Periods in Earth's History – Physical Geology

There were two main glacial periods within the Cryogenian, each lasting for about 20 million years: the Sturtian at around 700 Ma and the Marinoan at 650 Ma.

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