Panlongshan Fm
Type Locality and Naming
The type section is located at Panlongshan of Xingzihe in Zhenba County, Shaanxi. The reference section is at Huoyanxi of Xinglongchang in Zhenba County. It was named by Shaanxi Team of Regional Geological Survey during measured “Ziyang Geological Map”(1:200,000) in 1959, and was published by “The Regional Scale of Northwest China-Shaanxi Volume” in 1983.
Lithology and Thickness
Limestone. Lower part, 70.7 m thick, is composed of gray thin- to medium-bedded banded nodular limestone, intercalated with thick-bedded micrite and calcareous sericitic slate. Upper part, 72.4 m thick, is composed of gray thin- to medium-bedded micrite and dolomitic limestone intercalated with calcareous slate. Often the uppermost part has an intercalation of a bed of oolitic hematite, which can be a marker for the top boundary of this formation.
The thickness becomes thinner from north to south, 143 m thick in Paishangou in Huoyanxi, and only 68 m thick in Panlongshan.
Relationships and Distribution
Lower contact
It is in conformable contact with the underlying Tiekuangliang Fm of Upper Devonian.
Upper contact
It is in conformable contact with the overlying Early Carboniferous.
Regional extent
This formation is distributed in Zhenba plateau glacier area in east side of Xinxiang.
GeoJSON
Fossils
Lower part yields brachiopods Cyrtospirifer, Desquamatia, Schizophoria; coral Disphyllum, Pseudozaphrentis, Alveolites; and conodont, spore etc..
The upper part yields brachiopods Yunnanella, Yunnanellina, Tenticospirifer, and spore fossils.
Age
Depositional setting
Additional Information