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7 Cards in this Set
- Front
- Back
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mass extinctions |
1. global 2 all ecologies 3. short period (<1 million years) 4. large number extinction, 30% of total |
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methane clathrates |
methane caged inside water -only stable in ocean/under high pressure and cold temperature
-when sea level fall, oceans warm, clatherate breaks down, release methane gas (greenhouse gas) -in atmosphere, methane beaks down to CO2 -cause greenhouse and warming and breaks more clathrates |
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Anoxic ocean water |
water with no oxygen.
when surface ocean water became more saline than deep and since down, bring anoxic water up
-during global warming when evaporation is highest |
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periodicity |
by Raup and Sepkoski
26my periodicity, in past 250 my |
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periodicity by stothers and rampino |
periodicity in flood basalts, large impact and magnetic field reversals and mass extinction
33 +/- 3 my |
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pal creeer |
enhanced tubulence in core motion result from bombardment |
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leper and McCartney |
worked on math and said no to Pal / Creer |
