Layiek Fm

SW Tarim Basin. The Layilek Fm was named by Ma Shipeng, Wang Yuzhen et al. in 1981 and published in 1991. The type section is in Kandilik, southeast of Yecheng County, Xinjiang Weiwuerzhu Zizhiqu (Xinjiang Uygur Autonomous Region).

Synonym: （拉依勒克组）; Layilek Fm

In the type section, the Layilek Fm is composed of black, grey-black sericite carbonaceous slate, slate intercalated with fine-grained quartz sandstone and siltstone. The formation is characterized by monotonous color and bearing commonly pyrite and siderite. A laminated structure is commonly seen, but diagonal bedding is occasionally present as sedimentary structures. In the Kandilik area, there is a conglomerate bed on the top of the formation. The formation is 1764 m thick.