Kongshuhe Fm

Disconformable contact with the underlying Menghong Gr locally (see Regional extent)

Disconformable contact with the overlying dolomitic limestone and normal limestone of the Dadongchang Fm (see Regional extent)

Distributed in the Gudong, Mingguan and Qiaotou areas to the north of Tengchong County Town with a complete stratigraphic sequence, while to the south of Tengchong County Town the exposed stratigraphic sequence of the formation has been destroyed by faults to become an incomplete one. The regional lithology of the formation is relatively stable. In the area of the Kongshuhe Village of the Mingguan region, the Lower part of the formation is composed of sandy conglomerate, pebble-bearing sandstone, with a gradual upward transition to siltstone, siltstone and sparry bio-limestone, and is in a disconformable contact with the underlying Menghong Gr, with no top having been found, and with a thickness of 485.4 m. In the area of Dashuigou at Qiaotou there is no base of the formation having been found, with its Lower part being composed mainly of shale (or siltstone), and with its Upper part being composed of light-purple and light-grey thick-bedded sparry bio-limestone; it is in a disconformable contact with the overlying dolomitic limestone and normal limestone of the Dadongchang Fm, with a thickness of over 526 m. In the Shuangheyan area to the south of Tengchong County there are exposed only the middle and upper parts of the formation, which are composed of silty slate, sparry bio-limestone and crystalline limestone, with a thickness of 234.3 m. The contact relationship between the formation and its overlying Dadongchang Fm is unknown because of the intrusion of granite.