我们在北京地震地质会战工作所获实际资料的基础上,曾对北京平原区上新统一更新统的划分提出了初步看法,将第四系下限定在顺义组和夏垫组之间,年龄为距今243万年。此后,我们进一步系统研究了数个钻井,并对顺1井、通13井、通14井进行了热发光测定;又在顺1井的下、中更新统发现了显微熔融石;下更新统 Based on the actual data obtained by the earthquake and geological warfare in Beijing, we proposed a preliminary view of the division of the Neogene Unified Pleistocene in the Beijing Plain area, and defined the Quaternary as the lower limit between the Shunyi and Xiajiu formations, with an age of 2.43 million years ago. Since then, we have further systematically studied several wells and conducted thermal luminescence measurements of wells Shun 1, Tong 13 and Tong-14, and found microscopic fused silica in the lower and middle Pleistocene of Well Shun 1; System