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通过深海底栖有孔虫方解石的Ｍｇ／Ｃａ比值已经获得５０Ｍａ以来的深海温度记录。该记录在形式上与相应的底栖氧同位素比值（δ１８Ｏ）记录非常相似 ,并且显示了深海温度的４个主要变冷时期 ,总体下降约１２℃。底栖δ１８Ｏ记录和Ｍｇ 温度记录的一起应用表明 ,南极冰首次快
Deep sea temperature records have been obtained since 50 Ma by the Mg / Ca ratio of deep-sea benthic foraminiferal calcite. The record is quite similar in form to the corresponding benthic oxygen isotope ratio (δ18O) record and shows four major cooling periods of deep sea temperature, with an overall decrease of about 12 ° C. The application of the benthic δ18O record together with the temperature record of Mg indicates that the Antarctic ice is fast for the first time