Wutonggou Fm
Type Locality and Naming
The type section is located in the Quanzijie area of the Jimusar County, Xinjiang; and the reference section is situated on the northern wing of the Dalongkou Anticline about 8 km to the south of the Santai Country, JImusar County, Xinjiang. It was named by Tang Zukui in 1957, and was cited officially by the Compiling Group for the Regional Stratigraphic Chart of the Xinjiang Uygur Autonomous Region (1981).
Lithology and Thickness
Clastics. Composed of grey-green thick-bedded massive fine conglomerate, brown-red and grey-green medium-bedded fine-grained sandstone and siltstone, intercalated with black carbonaceous siltstone and massive marl, with a thickness of 220 m.
Relationships and Distribution
Lower contact
Conformable contact with its underlying Quanzijie Fm
Upper contact
Conformable contact with its overlying Guodikeng Fm
Regional extent
Distributed in an alignment from Urumqi to Jimusar. In the vicinity of Urumqi the rocks are coarser, while in the Jimusar area the rocks are finer, representing grey-green fine-grained sandstone and siltstone, intercalated with lenticular limestone and thin-bedded limestone, with no conglomerates and other coarse clastic sediments having been found. The formation has been exposed and extended westerly till the Manasi area, and to the south of the Shawan area. It is distributed in a small scale in the Tulufan Basin as well.
GeoJSON
Fossils
Yields Plant fossils (phytolites) such as Prynadaeopteris anthriscifolia, Callipteris zeilleri, Comia dentate, Iniopteris sibirica, etc., with the Megaspores being represented as the Triangulatisporites tuberospinosus-Verrutriletes ornatus assemblage. The Spore-pollens of the formation and of the Quanzijie Fm are jointly referred to as the Kraeuselisporites-Potonieisporites-Sulcatisporites assemblage. It also yields Bivalves such as Palaeommutela keyserlingi, Palaeanodonta cf. longissima; Ostracoda represented by Dawinula elongata parallela, Panxiania ovata; and Vertebrates represented by Dicynodonitia, etc.
Age
Depositional setting
It is interpreted as a river-facies deposit
Additional Information