3.5 billion years ago, oceans were cool, not hot

Idea that Earth’s ancient seas were searing and inhospitable has hit an icy patch

chert

 HOT IN SPOTS  Oxygen isotope data and field evidence from this chert in the Barberton Greenstone Belt in South Africa shows that, billions of years ago, the chert was altered and heated by localized hydrothermal activity on the ocean floor, not from a globally hot ocean. 

M. de Wit 

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