Xinchang Fm
Type Locality and Naming
The type section is at Xinchang in Taishan County, Guangdong. The Xinchang Fm was named by Nan Yi et al. in 1961, and was published by Central-South Compiling Group for Regional Stratigraphic Scale (1974). Following the naming of the Xinchang Fm, Mu Enzhi (1974, 1980) considered it as a chronostratigraphic unit. Wang Xiaofeng et al. (1979) and Li Jijin et al. (1985) restudied the type section.
Synonym: (新厂组）
Lithology and Thickness
The Xinchang Fm is composed of green, grayish green silty shale intercalated with fine-grained quartz sandstone. In the type area, the Xinchang Fm is 67 m thick.
Relationships and Distribution
Lower contact
The Xinchang Fm rests conformably on the silty shale of the Cambrian Bacun Fm (not yet in Lexicon)
Upper contact
It is conformably overlain by the black chert and siliceous shale at the base of the Xiahuangkeng Fm
Regional extent
GeoJSON
Fossils
Mu (1979) divided the Xinchang Fm into three graptolite zones, i.e. Staurograptus-Anisograptus zone, Aletograptus-Triograptus zone and Adelograptus-Clonograptus zone, in ascending order, and established the Xinchang Stage. However, Wang Xiaofeng et al. (1979) and Li et al. (1985) suggested that Mu's second graptolite zone does not exist in the Xinchang Fm at the type area, and its main elements are found at the base of the graptolite zone of Xinchang Fm in western Zhejiang.
Age
Depositional setting
Additional Information