Dongbula Fm
Type Locality and Naming
Named in 1985 by Wu Ruizong and others. The named profile is located in Dongbula Mountain in the Shuanghu area of northern Tibet.
Synonym:
Lithology and Thickness
Mainly carbonate rocks. Lower part is dominated by limestone, conglomerate limestone and conglomerate. Middle part is dominated by core-shaped limestone intercalated with mudstone. Upper part is composed of interbedded limestone, siltstone, fine sandstone and shell marl. The total thickness is greater than 260 m.
Relationships and Distribution
Lower contact
At the bottom, the conglomerate is in pseudo-integrated contact with the quartz sandstone of the underlying Bilong Fm
Upper contact
At the top, the sandstone is in integrated contact with the overlying Xiyaergang Fm
Regional extent
This group is mainly distributed in the north and south wings of the Dongbulashan anticline in the Shuanghu area of northern Tibet. The Dongbula Formation is similar to the Kangnan Formation near the Shuanghu Office. Wu Ruizhong et al. (1985) compared this formation with the Xishuanghu Formation in the stratigraphic correlation table, which is very inappropriate.
GeoJSON
Fossils
Contains bivalve fossils Plagiostoma beyrichi, Posidonia cf. bosniaca, Septaliphoria sinensis, S. xingyiensis, etc.
Age
Depositional setting
It is shallow water sedimentation.
Additional Information