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Proterozoic

Proterozoic. Snowball Earth Theory. Snowball earth theory. From 750-600 Million years, lots of glaciers Sea ice 0.5 mile thick, temp ~ -40° everywhere Most organisms die. How to warm up to form limestone?. No photosynthesis Build up of CO 2 Switch to hothouse

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Proterozoic

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  1. Proterozoic Snowball Earth Theory

  2. Snowball earth theory • From 750-600 Million years, lots of glaciers • Sea ice 0.5 mile thick, temp ~ -40° everywhere • Most organisms die

  3. How to warm up to form limestone? • No photosynthesis • Build up of CO2 • Switch to hothouse • Ready for explosion of life after Proterozoic

  4. Snowball Earth Theory • Global glacial deposits younger than 600 Ma • On top, limestone

  5. Snowball Earth Theory • Limestone only forms in warm water • Limestone dissolves in cold water

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