3.5 billion years ago would have formed only in deep,
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, cold seas. These findings suggest that both the shallow environment and deep waters were cool. Ambient ocean temperatures must have been close to 0°Celsius,
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, de Wit says. ?
Paleomagnetic data point to a colder-than-expected global environment,
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, too, de Wit and Furnes found. As volcanic rock cools,
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, minerals within the rock capture the prevailing magnetic pole direction,
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, which reverses every few hundred thousand years. The data can be used to reconstruct the latitude at which rocks formed — in this case,
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, a nearly tropical 20° to 30°. “Because there was ice near sea level at low latitudes,
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,” de Wit says, “the oceans and atmosphere were globally likely to be cold.”
What’s more,
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, de Wit and Furnes figured out why previous researchers had interpreted ocean temperatures to be 30° C to 80° C during this time (compared with near 0° C to about 16° C for modern oceans). Two periods of searing-hot hydrothermal activity had cooked both the seafloor cherts and the surface glacial sediments. In the older seafloor sediments from the

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