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Hoffman and Schrag - Coggle Diagram
Hoffman and Schrag
discoveries
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carbonate found in ocean, hinting large amounts of co2 in atmosphere
couldve led to planet heating, ending glaciation
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"snowball earth"
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long periods of extreme, isolated environments
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being examined in rocks in australia, china, western US, svalbard (1992~)
namibia cliffs 1992, at the time was subsiding continental shelf
Glaciers
used to be at least 4000 meters high at the worst of the ice age, and at some point at least 5000 meters high
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found in tropic, survival under heat unexplained
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