Lengshuiwu Fm
Type Locality and Naming
The name of Lengshuiwu Formation was given by Li Zhonghong et al. (1961). The type locality is in Lengshuiwu of Zhongban, Yiyang County. The key section is the Lengshuiwu section in Zhongban, Yiyang of Jiangxi (117º22'42″, 28º32'30″).
Lithology and Thickness
The Lengshuiwu Formation is a group of clastic rocks, dominated by multi-colored sandstone, siltstone, mudstone, with interbeds of gravel bearing sandstone and conglomerate, locally with tuff intercalations. Crossbedding is developed. It is 165 m- 1545 m in thickness.
Relationships and Distribution
Lower contact
The Lengshuiwu Formation normally placed as conformably overlying the Shixi Fm; but Li, Xianghui et al. (2019) conclude the intervening ca. 129 to 123 Ma is a hiatus.
Upper contact
The Lengshuiwu Formation is unconformably underlying the Maodian Fm in diagram of Xi et al (2019; Cretaceous integrated stratigraphy and timescale of China); but Maodian Fm is in S. Jiangxi, whereas Lengshuiwu Fm is in north-east Jiangxi.
Regional extent
GeoJSON
Fossils
The formation yields fossils of bivalves Trigonioides (Trigonioides) kodairai, Nakamuranaia chingshanensis, Sphaerium jeholensis, S. pujiangense; ostracod Mongolianella palmosa, Cypridea yiyangensis, Damonella cf. ovate, D. cf. contracta, Darwinula aff. Leguminella, Rhinocypris jurassica, Clinocypris cf. scolia; Conchostracans Yanjiestheria kyongsangensis, Y. sinensis, Migransia sp., Orthestheria intermedia, Migransia sp., Neodiestheria sp.; gastropods Probaicalia aff. Vitimensis, Gyraulus cf. dongcunensis; plant Ruffordia goepperti, Gleichenites cf. giesekianus, Pseudofrenelopsis sp., Cupressinocladus cf. elegans, Brachyphyllum cf. brikae; insect Jiangxicoleus yiyangensis, Yiyangia houbashanensis, Yumenocoleus tenuous; spore and pollen Classopollis sp., Exesipollenitssp., Cicatricosisporites sp., Schizaeoisporites sp.
Age
Depositional setting
Additional Information