Kanglu Fm

Wen Shixuan named it in 1979. The named section is located on the north slope of Kanglu Mountain, 2 km northwest of Shuanghu Office, Shuanghu County, northern Tibet. The Yuankanglu Fm represents the clastic rock stratum of the early Triassic in Shuanghu area, northern Tibet. In 1987, Chen Dequan named the lower part as the Xishuanghu Fm (now used for latest-Early Triassic in this region), while the upper part still used the Kanglu Fm, and the original meaning of the Kanglu Formation was maintained in this book.

Synonym: Wang Ruizhong et al. (1985) used the "Xishuanhu Fm" as a stratigraphic unit in the uppermost part of the Lower Triassic in the Shuanghu area of Tibet. Chen Dequan (1987) named the stratigraphic unit in the uppermost part of the Lower Triassic in the area again with the "Xishuanhu Fm", and the latter was an invalid stratigraphic name.

Mainly purplish red, grayish purple and dark purple clastic rocks. Lower part is mainly composed of gray sandstone, gray-white fine sandstone and siltstone, with a small amount of silty mudstone and two layers of coal line. Upper part is dominated by dark purple sandstone, sandwiched sandstone and mudstone, and large symmetrical ripple marks are developed. The top is gray-black siltstone, silty shale with marl, 1028 m in thickness.

Bivalves can be divided into three assemblages from the bottom to up: Claraia stachei assemblage, Claraia aurita assemblage, and Eumorphotis multiformis assemblage.

From bottom to top, the formation inherited from the continental environment at the end of the Late Permian to the littoral and shallow sea environment.