研究区位于喀喇昆仑山北坡的天神达坂—克什尔村—甜水海一带。该区属地质空白区,以往仅在远离本区的西部米计干沟和叶尔羌河黑黑孜地段,依据零星资料确定有寒武—奥陶系。前者岩性为碳酸盐岩、变质碎屑岩(未见顶底),依岩性可分四个亚群,在中、上部的浅变质岩中发现Heliolites和海百合茎化石,故将地层时代定为寒武—奥陶纪,并命名为米计干群((?)—0)mj;后者岩性为碎屑岩夹碳酸盐岩,产三叶虫和腕足类化石,时 The research area is located in Tianshisabashan - Kesheer Village - Tianshuihai area on the northern slope of Karakoram Mountain. This area belongs to the geological blank area. In the past, only in the western Miqiangangou and Yarkand Heihezi areas away from this area, the Cambrian-Ordovician system was identified based on sporadic data. The former lithology is carbonate and metamorphic clastic rocks (no top and bottom), and can be divided into four sub-groups according to lithology. Heliolites and sea lily stem fossils are found in middle and upper metamorphic rocks. Therefore, The age was designated as Cambrian Ordovician, and was named as Mi Ji Ganqu ((?) - 0) mj; the latter was lithic clastic rock with carbonate rocks producing trilobites and brachiopods