Pantiange Fm
Type Locality and Naming
Lanping Basin. It was named in 1954 by Yunnan regional geological survey team, the named section is located in Pangtiange, west of Yunnan.
Synonym:
Lithology and Thickness
Massive volcanics. The lithology is mainly white massive rhyolite, grey-green rhyolite volcanic breccia sandwiched with tuff slate and sericite slate. The thickness of the strata is 1270 m.
Relationships and Distribution
Lower contact
The bottom boundary is marked by the occurrence of rhyolite and the underlying contact is pseudo-conformable. Coeval and in same region as the Cuiyibi Fm volcanics, which are underlain by the Shanglan Fm. Originally, the Cuiyibi Fm represented intermediate-basic volcanic rocks predominated strata around the Weixi County of Yunnan Province, and stratigraphically below the Pantiange Fm of Middle Triassic and above the Shizhongshan Fm of Upper Triassic
Upper contact
The Pantiange Fm and coeval Cuiyibi Fm are unconformably overlain by the Waigucun Fm
Regional extent
In the area of Pangtiange and Qingshuijiang in West Weixi, rhyolite is the main rock, and there is a lot of tuffaceous shale and limestone lens in the upper part, the thickness is greater than 1270 meters. Huinan to the Sanchahe area in Lanping, the upper intercalation is reduced, while the dacite rhyolite is increased, and the thickness is greater than 1746 m
GeoJSON
Fossils
The strata contain bivalve fossils Halobia sp., Posidonia sp., Unions sp., Manmuensis, U. elliptica, Pseudoardinia sp., P. aff. sibiriconchiformis and leaf limbs fossils Euestheria sp., Palaeolimnadia sp.
Age
Depositional setting
It is interpreted as Marine eruptive environment
Additional Information