Guitang Fm
Type Locality and Naming
The type section is located near Guitang Village (110°21’E-22°45’N), 3.5 km north of the Beiliu county seat, Guangxi. It was named by Wang Yu et al. in 1965.
Lithology and Thickness
Limestone. Lower part, ca. 200 m thick, is mainly composed of gray calcarenite and bioclastic limestone, grainstone intercalated with dolomite, dolomitic limestone containing tabulate coral, bioherm and reef limestone bearing stromatoporoids. Upper part, ca. 250 m thick, consists of bioclastic limestone and calcarenite intercalated multiple beds of fine-grained calcareous quartz sandstone and few dolomitic limestone. A 2-m-thick sandstone separates the two parts of the formation. Brachiopods and corals occur in the top and base of the upper part.
Relationships and Distribution
Lower contact
A basal thick-bedded bioclastic limestone and grainstone separates it conformably from the underlying Huangjingshan Fm dolomite.
Upper contact
This formation is conformably overlain by the Yarang Fm.
Regional extent
The formation is scattered in distribution and can be observed at Guiping, Lingshan, Liujing of Hengxian, Bahe of Tiandeng, Pingshan of Longan, Longguang of Debao, Baping of Baise and Dachang of Nandan counties in the Guangxi Zhuangzu Autonomous Region, and also at Guanziyao in Guizhou Province. The distribution is generally controlled by its facies.
GeoJSON
Fossils
It contains abundant benthos fossils, including Brachiopods of Zdimir-Megastrophia assemblage, Corals of Trapezophyllum cystosum assemblage, and Tabulata corals of Beiliupora assemblage.
Age
Depositional setting
It is interpreted as carbonate platform marginal reef facies and near-reef facies depositional environments.
Additional Information