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本区地层区划属于塔里木区莎车分区的喀什和英吉莎两个小区。区内中新生代地层随断陷盆地呈条带状分布,不整合于古生代地层之上,在天山前缘由北向南从老到新依次出露,而昆仑山前缘则与之相反,岩层北倾。本区上白垩统和下第三系为正常海相及滨海泻湖相沉积。含有以海相双壳类、介形虫及有孔虫为主的动物群及孢粉、藻类等化石。上第三系虽以陆相碎屑沉积为主,但下部仍有海陆过渡相的沉积,含有广盐度有孔虫和介形虫化石。上白垩统到第三系总厚4000—9000米,现从老到新将各组地层介绍如下:
The stratum divisions in this area belong to Kashgar and Yingjisha, two districts of Shache District in Tarim District. The Mesozoic and Cenozoic strata in the area are distributed in a stripe pattern along the fault depression basin and are not integrated with the Paleozoic strata. The front of the Tianshan Mountains are exposed from old to new from north to south in turn, while the front of the Kunlun Mountains is opposite. pour. The Upper Cretaceous and the Lower Tertiary in this area are normal marine facies and sediments of lagoon lacustrine facies. Contains marine bivalves, ostracods and foraminifera-based fauna and sporo-pollen, algae and other fossils. The upper Tertiary, although mainly composed of continental clastic sediments, still has sediments of marine-continental transitional phase in the lower part, and contains broad-salinity foraminifer and ostracode fossils. Upper Cretaceous to the Tertiary total thickness of 4000-9000 meters, now from old to new will each group stratum as follows: