Xiaoshansayi Fm
(4), Kungurian Stage (late-Cisuralian Epoch; late-Early Permian)
Type Locality and Naming
The type section is located in the Qunjisar area of the Awu Mt. to the south of the Nyleke County, Xinjiang. It was named by the 9th Expedition under the Xinjiang Geological Bureau in 1979.
Lithology and Thickness
Sandstone. Lower part is composed of purple-brown tuffaceous sandy conglomerate, conglomerate, tuffaceous sandstone and siltstone. Middle part is composed of yellow-brown and grey coarse- and fine-grained greywacke, and medium- and fine-grained feldspar-quartz-greywacke. Upper part is composed of interbeds of grey and black shales, siltstone and marl; and its top part is composed of medium- and coarse-grained lithoclastic feldspar-rich sandstones and polymineralic fine-grained sandstone.
Relationships and Distribution
Lower contact
Disconformable contact with the underlying Tardetao Fm
Upper contact
Effusive unconformable contact with the volcanics of the overlying Tamqisayi Fm
Regional extent
Distributed in the western segment of the Awulale Mt., as well as the area to the north of Yining City.
GeoJSON
Fossils
Plant fossils (phytolites) such as Paracalamites cf. stenocostatus, Noeggerathiopsis cf. derzavinii, N .cf. latifolia, Cardiocarpus cf. cordai, Radicites? sp., Walchia sp.; and Insect fossils such as Scytinopteridae; and Esteria sp., etc.,
Age
Depositional setting
It is interpreted as river-facies clastic deposits.
Additional Information