Chayuantou Fm
Type Locality and Naming
The type section of the Chayuantou Formation is the Chayuantou section at Chayuantou in Xinning County (111°02’E，26°34’N), and was measured by the Hunan Regional Survey Team in 1974. The Chayuantou Formation was first published by Zhang (1997). The name is derived from the Chayuatou village, Qinghiangqiao Township, Xinning County, Shaoyang City, southwestern Hunan Province. The name was originally appeared in a 1988 manuscript by Luo Haiyan and Huang Weipei.
Synonym: (茶园头组)
Lithology and Thickness
The Chayuantou Formation is mainly an epi-metamorphic clastic sequence, composed mainly of grey, dark grey, and greyish black, thick-bedded, fine-grained quartz sandstone, intercalated or interbedded with slate, among which there are only a few of carbonaceous slate. In the type section, the formation is 682.9 m thick.
Relationships and Distribution
Lower contact
The Chayuantou Fm rests conformably on the Xiangnan Fm
Upper contact
It is conformably overlain by the Xiaozijing Fm with carbonate rocks at base and top.
Regional extent
The Xiangnan Formation is widely exposed in the far southern and southeast Hunan Province.
GeoJSON
Fossils
The fossils are rare in the Chayuantou Formation, with a few of brachiopods and sponge spicules, including Acrothele sp., Lingulella sp., Obolus sp. and Protospongia sp. Also, there are a few of acritarch Micrhystridium sp., Orygmatosphaeridium sp., Polyporata sp., Quadratimoprpha sp. etc.
Age
Depositional setting
Additional Information