B. Hallet B.B. Hanshaw 1978 <p><span>Isotopic analyses of subglacially precipitated calcite from near a modern temperate glacier show that the δ</span>¹⁸<span>O (=&nbsp;</span>¹⁸<span>O/&nbsp;</span>¹⁶<span>O relative to standard mean ocean water) of the calcite records the δ</span>¹⁸<span>O of the ice from that glacier. It may therefore be possible to determine the δ</span>¹⁸<span>O of Pleistocene ice sheets on the basis of isotopic analyses of calcite formed under that ancient ice. This, in turn, would allow estimation of the δ</span>¹⁸<span>O of Pleistocene oceans and correction of the paleotemperature scale based on foraminiferal oxygen isotopic analyses. Copyright&nbsp;</span></p> application/pdf 10.1126/science.200.4347.1267 en Science Oxygen isotope composition of subglacially precipitated calcite: Possible paleoclimatic implications article