Maoshan Fm
Type Locality and Naming
Li Yurau et al (1935) proposed the name Maoshan Sandstone with the type section located at Dinggong, Maoshan, about 60 km south of the Jurong County seat, Jiangsu Province. The lateral equivalent/ similar to Maoshan, Juken Fm was proposed by the Anhui Party of Regional Geological Survey (1982) with the type section located at Juken, 3 km north of Xinming, northeast of Xianyuanzhen Town, Huangshan City in southern Anhui Province.
Synonym: (茅山组)
Lithology and Thickness
The formation, 115 m in total thickness, is subdivided into three parts. The Lower part consists of grayish white fine-grained quartzose sandstone intercalated with thin-bedded purplish red siltstone (with cross-bedding). The Middle part is purplish red medium-to-fine-grained quartzose sandstone intercalated with siltstone and sandy shale. The Upper part gray, grayish yellow and grayish white medium- to fine-grained quartzose sandstone.
Relationships and Distribution
Lower contact
It is continuous deposited from the underlying Fentou Fm
Upper contact
It is pseudo-conformably overlain by the basal conglomerate of the Wutong Fm of the Upper Devonian.
Regional extent
It is widely exposed in south Jiangsu Province in thickness ranging from 40~200 m. According to the sedimentary criteria (e.g., the huge cross-beddings), the formation probably represents different parts of the underwater delta deposits and might belong to marine-terrestrial alternating deposits (Chen Xu et al, 1988). The formation is only 20-30 m thick and consists of purplish red thick-bedded sandstone, intercalated with gray sandstone at the base in the adjacent area of Nanjing City. The Juken Fm is basically similar to the Maoshan Fm in lithology, biofacies and horizons. This lateral equivalent Juken Fm is composed of purplish red, yellowish green and grayish white quartzose sandstone, fine-grained sandstone and argillaceous siltstone.
GeoJSON
Fossils
The Maoshan Fm bears rare fossils, only Sinogaleaspis, and bivalve, algal Leiopsophosphaera, Trachysphaeridium, Lophosphaeridium, etc.
The only fossil finds are the low differentiated littoral fauna such as brachiopod Lingula, gastropod, bivalve and fish in the lateral equivalent Juken Fm
Age
Depositional setting
Additional Information