Cuizhuang Fm
Type Locality and Naming
West Henan. The Cuizhuang Fm was named by Han Yingshan, Yan Lianquan in 1952. The type locality is at Cuizhuang Village, Ruyang County, Henan Province. The reference section is at Caoyangguan Village, Xiatang Township, Lushan County, Henan Province. Lowermost formation of Luoyu Gr.
Synonym: （崔庄组）
Lithology and Thickness
The Cuizhuang Fm is composed of variegated shale and minor quartz sandstone, intercalated with calcareous sandstone, glauconite quartz sandstone and carbonaceous shale. Oolitic hematite (Fe-oolite) and siderite are intercalated respectively in the basal and the middle parts of the formation. Ripple marks and desiccation cracks are often seen on bedding surfaces in sandstone. It is rather stable both in lithological character and thickness in the distribution area, and may serve as index horizon for regional correlation. It is 213 m thick in the reference section, but variable among different areas, for example it is about 197 m in Mianchi, 159-227 m in Ruyang and Lin'an; 130 m at Wufoshan, Yanshi; 208 m at Xiaodingshan, Fangcheng; 195 m in Wuyang City.
Relationships and Distribution
Lower contact
It conformably rests on the underlying Beidajian Fm (upper Ruyang Gr)
Upper contact
It is in conformable contact with Sanjiaotang Fm.
Regional extent
West to SW-Central Henan.
GeoJSON
Fossils
The formation yields rich microplants, the major taxa are: Trachysphaeridium cultum, T. aff. laminaritum, Laminarites antiquissimus,etc.
Age
Depositional setting
Additional Information