Qingshiya Fm
Type Locality and Naming
The Qingshiya Fm is the second highest formation of the Zhashui Gr. The type section is located at Qingshiya of Xiahekou village, Shanyang County, Shaanxi Province. It was named by Shaanxi Team of Regional Geological Survey in 1968, and was published by Du Dinghan in 1986.
Lithology and Thickness
Siltstone, claystone, limestone. The formation is subdivided into three parts: Lower part is composed of metamorphosed siltstone and sandstone with limestone intercalations that gradually changes upward to a rhythmical sequence of slate and siltstone. Middle part consists of slate and phyllite intercalated with limestone and partly with siderite beds. Upper part is dominated by slate with limestone and siltstone intercalations.
The thickness is ranging from 1428 m to 3783 m.
Relationships and Distribution
Lower contact
The formation rests conformably on the Chigou Fm.
Upper contact
The formation is overlain by the Tongyusi Fm.
Regional extent
This formation is distributed at Sannan, Shanyang, Zhashui, Ningshaan. In the east of Shanyang, only the lower part outcrops and is characterized by deeply metamorphosed rocks, such as two-mica quartz schist and garnet-bearing two-mica quartz schist intercalated with amphibole meta-conglomerate and graphitic marble, and is 1428 m thick. Westward to Ningshaan-Taibai area, it consists of clastics with 800-1500 m thickness.
GeoJSON
Fossils
At the Eryuhe section, the lower part of the formation yields brachiopods Atrypa richthofeni, A. kansuensis, “Ambocoelia” sinensis, Emanuella sp., Schizophoria sp.; and spores Arachaeozonotriletes variabilis, Verouciretusispora robusta. The important fossil spores in the upper part are Stenoozonotriletes conformis, Diducites versabilis, Convolutispora opprassa and Verrucosisporites sp.
Age
Depositional setting
Additional Information