Kujirtai Fm

Disconformable contact with the intermediate-acidic volcanic rocks of the underlying Molaoba Fm.

None given

In the Arxilie area to the southwest of Tuoli County Town the formation is unconformably overlapping the Baogutu Fm of the Early Carboniferous, representing river-lake facies deposits. Lower part of the formation represents a rhythmite of grey-green siltstone, sandstone and conglomerate, intercalated with many layers of thin coal seams, with a thickness of about 500 m. Upper part of the formation consists of grey-green conglomerate, intercalated with medium- and coarse-grained sandstones, as well as siltstone and volcanic-rock lenses, with a thickness of about 1500 m, yielding plant fossils (phytolites) which comprise Noeggerathiopsis derzavinii, Pecopteris anthriscifolia, Koretrophyllites linearis, Callipteris zeilleri, Xinjiangopteris toksunensis, etc., that are closer to those found in the Lucaogou Fm and Hongyanchi Fm on the southern margin of the Jungghariya. In the area of Liushugou at Tuoli the exposure of the formation consisting of sandy conglomerate is incomplete. It is distributed also in the lower reaches of the Karabula River, as well as in the northern part of Tacheng County. The thickness of the formation is only 83 m in the area of Qiargaye River and other places in the Burkerstai region.