Primary establishment of stratigraphic section in plain area of Beijing: Archean crystalline basement and Proterozoic strata

Systematical geological section has not been established in Beijing plain area. Western Hills of Beijing were divided into 3 systems by R. Pumpelly in 1867 and 12 layers by F. V. Richthofen in 1871. The Sinian strata were limited to pre-Cambrian by A. W. Grabau in 1922. The Nankou geological section was divided into 7 formations by Tian Qi-juan in 1923. The Sinian strata were divided into 3 groups which were Nankou Group, Jixian Group and Qingbaikou Group by Gao Zhen-xi in 1934. The Qingbaikou Group was divided into 3 formations of Xiamaling Formation, Longshan Formation and Jingeryu Frmation by Qiao Xiu-fu in 1976. The Ming Tombs geological section was divided into 4 systems and 12 formations by Wang Chang- qing in 1980. In 1991, ‘Regional Geology of Beijing Municipality'divided Ming Tombs into 3 systems and 12 formations. This paper established a stratigraphic table in Beijing plain area and detailed Archean gneiss and Proterozoic strata. The Archean gneiss was discovered in Yufa"Xingre-1 Well"and Anding"Xingre-2 Well". The Jixian system from Jingre-70 Well, Jingre-59 Well, Jingre-71 Well and Jingre- 75 Well was cataloged. The Xiamaling Formation to be established and Longshan Formation and Jingeryu Formation of Qingbaikou system were also cataloged at Yizhuang Primary School of South Beijing.