Talak Fm

Kuqa Depression, NW Tarim. The naming section is on the southern limb of the Kumugeliemu anticline, Baicheng County, Xinjiang, and the reference section is located in the vicinity of the Xiao Kuzibai Gully in the northern part of Baozidong, Wensu County, north of Aksu, Xinjiang. Upper formation in the Kumugeliemu Gr. Named the Talak Group by the Second Geological Party, Xinjiang Bureau of Geology in 1963.

Lagoonal deposits, consisting predominantly of grayish white or gray gypsum rock with dolomite, dolomitic mudstone, marlstone and siltstone and fine sandstone, the base of which is grayish brown or gray, thick-bedded sandy conglomerate with sandstone, sandy mudstone and gypsum rock. The thickness is 200–300 m.

From below upward the reference section contains three sporopollen assemblages: the first assemblage may correlate with the early Paleocene sporopollen assemblage in Turkmenistan and Kazakhstan of the former Soviet Union; most elements of the second assemblage appear in Paleocene strata of Europe and Asia, as well as Jiangxi and Hubei of China; and the third sporopollen assemblage is similar to that in the late Paleocene Qimugen Fm. In addition, there is also the bivalve Brachidontes elegans, which was also found in the Thaneitian Stage of Britain. The ostracod Loxoconcha lacula is found in the Suzake Formation of the Tajik basin of the former Soviet Central Asia region and also in the Paleogene of Fergana basin.

It is interpreted as lagoonal deposits.