The Snowball Earth Hypothesis - Atmospheric and Oceanic Sciences

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How carbon isotopes relate to capcarbonates• Cap carbonates – sediments that weredeposited toward the end of theNeoproterozoic glaciations• Scientists found suprisingly high levels of 12 C inthese sediments• The ratio of carbon isotopes suggested thatalmost no photosynthesis had occurred in thewaters from which the rocks precipitated
No light – No photosynthesis!• This was exactly what would occur if ice hadcovered the Earth and starved it of light!
Page 5: Neoproterozoic Snowball Era• This
Page 11 and 12: Conclusions from Paper 1• Widespr
Page 13 and 14: However…• If this were the case
Page 15 and 16: Therefore…• There is more evide
Page 17: Carbon Isotope Theory• Marine mic
Page 21 and 22: Did this methane contain high level
Page 23 and 24: Conclusions:Four proposed stages of
Page 25 and 26: Conclusions…
Page 27 and 28: Vostok delta TS4oC2HoloceneIntergla
Page 29 and 30: Vostok CH47006506005505004504003503
Page 31: References• Schrag, Daniel P., Be

The Snowball Earth Hypothesis - Atmospheric and Oceanic Sciences

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