Evidence For Past Temperatures
See also: paleoclimatology and paleothermometerOur evidence for past temperatures comes mainly from isotopic considerations (especially δ18O); 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.
Read more about this topic: Geologic Temperature Record
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