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Geologic temperature record : ウィキペディア英語版
Geologic temperature record

The Geologic temperature record are changes in Earth's environment as determined from geologic evidence on multi-million to billion (109) year time scales. The study of past temperatures provides an important paleoenvironmental insight because it is a crucial component of the climate and oceanography of the time.
==Evidence for past temperatures==

Our evidence for past temperatures comes mainly from isotopic considerations (especially ); the Mg/Ca ratio of foram tests, and alkenones, are also useful. Often, many are used in conjunction to get a multi-proxy estimate for the temperature. This has proved crucial in studies on glacial/interglacial temperature.

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