Paleothermometer
Study of ancient temperatures / From Wikipedia, the free encyclopedia
A paleothermometer is a methodology that provides an estimate of the ambient temperature at the time of formation of a natural material. Most paleothermometers are based on empirically-calibrated proxy relationships, such as the tree ring or TEX86 methods. Isotope methods, such as the δ18O method or the clumped-isotope method, are able to provide, at least in theory, direct measurements of temperature.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/5/5f/All_palaeotemps.svg/640px-All_palaeotemps.svg.png)
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