Tertiary fossil oysters and clams from sites in southern Victoria, Australia, of about lat. 38° S. have been used to determine paleotemperatures from their O¹⁸/O¹⁶ ratio. High temperatures were found in the Upper Oligocene-Lower Miocene with a fairly sharp drop into the Middle Miocene.
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F. H. Dorman (1966) studied this question.
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