palaeothermometry
/ˌpalɪəʊθəˈmɒmɪtri/ /ˌpeɪlɪəʊθəˈmɒmɪtri/Geology
noun
The investigation of the temperature of climates and oceans in the geological past.
Origin
1950s; earliest use found in Chemical Abstracts. From palaeo- + thermometry, after palaeothermometer.