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Seasonal and Multi-Decadal Climate Cycles Persisted during Snowball Earth, Scientists Say

A new analysis of exquisitely preserved laminated rocks (varves) from the Port Askaig Formation on the Garvellach Islands, Scotland, shows that climate oscillations occurred on annual, decadal, and centennial timescales during the Sturtian glaciation (717-658 million years ago), the most severe Snowball Earth event.

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