Donghe Gr

Zhao Yazeng and Huang Jiqing erected the Donghe conglomerate in 1931. The type locality is in Shuangshipu of Fengxian, Shaanxi Province.

The Donghe conglomerate was assigned to Jurassic or Early Cretaceous (the authors considered that the Donghe conglomerate is exactly the same as the Qianfoyan bed). In 1943 Yang Zhongjian and Bian Meinian renamed the Donghe conglomerate as the Donghe series. In 1944 Ye Lianjun and Guan Shichong called the coal measures in the Huaya area of Chengxian of Gansu the “Jishan coal measures” and the strata under them were still called the Donghe conglomerate, collectively called the Donghe series”. In 1968 the Shaanxi Regional Geological Survey Team called the strata mentioned above as the Donghe Group, which can be divided into three subgroups, the lower, the middle and the upper. In the report entitled “The Preliminary Study on the Characteristics and Age of the Coal-bearing Sediments of the Donghe Group of the Huicheng Basin”, Qi Hua (1974) divided the Donghe Group in the ascending order into the Tianjiaba Fm, Zhoujiawan Fm and Huaya Fm formations. Of them, the “Huaya Formation” has the same implication as does the “Jishan coal measures”, which have all been assigned to Early Cretaceous. In 1994 the Gansu Lithostratigraphic Sorting Group discarded the “Huaya Formation”, renamed it the Jishan Formation and placed it on the Donghe Group. Now the Donghe Group is divided in ascending order into the Tianjiaba Fm and the Zhoujiawan Fm.

The Donghe Formation is represented by purple red and gray green conglomerate with sandstone and mudstone.

See component formations