The natural thermoluminescence (NTL) of foraminiferal shells from piston cores MD81349 and MD77181 from the Ninetyeast Ridge and the Bengal Fan of the Indian Ocean were studied for the climate changes during the past 300 ka.

• 东北印度洋赤道90°E海岭和孟加拉扇MD81349；MD77181岩心记录了30万a来气候变化的历史.