通过对深海沉积物的研究,人们对第四纪的气候变迁史已了解得比较清楚了,根据Emiliani和shackleton等人所测得的古温度曲线,Kukla把最近的二百万年从新到老地划分为41个阶段,以奇数阶段代表温暖期,以偶数阶段代表寒冷期,以相邻的两个(或四个)阶段代表一个冰川旋回,布容正极性世(即最近的71万年)包括19个阶段,8个完整的冰川旋回(图1A)。 Through the study of deep-sea sediments, the history of climate change in Quaternary has been well understood. According to the ancient temperature curve measured by Emiliani and Shackleton, Kukla put the recent two million years from new to old age Divided into 41 stages, the warm stage is represented by the odd stage, the cold stage is represented by the even stage, and the glacier is represented by the adjacent two (or four) stages. The positron world (ie the most recent 710,000 years) Including 19 stages, eight complete glacier cycles (Figure 1A).