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宁芜、溧水地区为下扬子成矿带的重要地区之一。前人对本区上侏罗统做过很多研究。西横山组一名系地质部第六石油普查大队创建,归属中侏罗世,但无化石依据。1970—1972年,江苏区调队二分队对西横山组地层进行了研究,建立了地层层序,并发现了腹足类、植物、叶肢介、介形类及孢粉等门类化石,对西横山组的涵义作了修订。1981年三分队又采获了昆虫、瓣鳃等化石。化石由南京地质古生物研究所、南京地质矿产研究所及钱清鉴定。
Ning Wu, Lishui area for the Lower Yangtze metallogenic belt one of the important areas. The predecessors did many studies on the Upper Jurassic. West Yokoyama formation of a Department of Geology sixth oil census team to create, belongs to the Middle Jurassic, but no fossil basis. From 1970 to 1972, Jiangsu Regulated Second Detachment studied the formation of the West Yokoyama Formation, established the sequence of stratigraphy, and discovered some types of fossils such as gastropods, plants, leaf extremities, ostracods and sporopollen. The meaning of West Hengshan group was amended. In the third quarter of 1981, insects and petular gills were harvested. Fossils from Nanjing Institute of Geology and Palaeontology, Institute of Geology and Mineral Resources and Nanjing Qianqing identification.