Time runs left (older) → right (younger) · Hover a card for details
Snowball Earth — two global glaciations (717-635 Ma).
717.00 Ma – 635.00 Ma · 82.00 Ma duration
Axis labels in Ma (millions of years ago) ·
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Cryogenian Period 2
717 Ma – 660 MaSnowball Earth — SturtianFirst global glaciationGlaciers advance to the equator, freezing the entire ocean surface. Life survives in isolated refugia.
650 Ma – 635 MaSnowball Earth — MarinoanSecond global glaciationSecond global glaciation; its dramatic end triggers the Ediacaran explosion of animal life.