sea-level record of the past million years lecture 18
Post on 21-Dec-2015
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Sea-level record of the past million years
Lecture 18
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This record of d18O is from planktonic forams from a core in the sub-tropical Atlantic ocean.
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It is a record of temperature and ice volume for the past 130,000 years or so.
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A longer record from a core in the Equatorial Pacific ocean.These are divided into time-rock (chronostratigraphic) units,
the Marine Oxygen Isotope stages
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A tabulation of the Marine Oxygen Isotope ages
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The cyclic filling and drawing down of the world oceans has a profound effect on processes and history along coastlines.
Let’s revisit the littoral clastic record, and then we’ll turn to the record of fringing coral reefs
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An example from Half Moon Bay, central California
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Mahia peninsula, North Island, New Zealand
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Pasadena
Palos Verdes peninsula
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Fringing reef terraces
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Ages by alpha-particle counting, ~1968, at Columbia University
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Ages by thermal ionization mass spectrometry, ~1988, here at Caltech
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