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四川嘉定群为海姆(Heim,1932)命名于乐山,长期被视为白垩系。1972年,四川省地质局第二区调队根据四川盆地西部地层系统将之划分为夹关组、下灌口组和上灌口组,并将夹关组和下灌口组归于下白垩统,上灌口组归于上白垩统,但一直无化石依据。1978年,四川省地质局和我所联合踏勘小组采获大量介形类化石,经笔者之一鉴定,改下灌口组为灌口组,归为上白垩统,改上灌口组为名山群,归为下第三系。其后,四川省地质局航空地质队二分队不仅多次补采了乐山剖面的化石,而且从1977年以来,在川南原套名为嘉定群的各剖面上采集了大量介形类标本,并将川南的嘉定群自下而上划分为窝头山组、
The Jiading Group in Sichuan is named Leshan for Heim (1932) and has long been regarded as the Cretaceous. In 1972, the Second Regiment of Sichuan Geological Bureau adjusted the division into the clanking group, the under-filling group and the up-filling group according to the stratigraphic system of the western Sichuan Basin and assigning the clanking group and the under-filling group to the Lower Cretaceous , Upper Irrigation Group attributed to the Upper Cretaceous, but there is no fossil basis. In 1978, the Sichuan Provincial Bureau of Geology and the United Exploration Group collected a large number of mesogenic fossils. After identification by one of the authors, the Guankou Formation was changed into the Guankou Formation, the Upper Cretaceous and the Guankou Formation into a famous mountain Group, be classified as under the third line. Since then, the Second Team of the Aviation Geological Team of the Sichuan Bureau of Geology has not only replenished the fossils of the Leshan profile on several occasions, but also collected a large number of meso-type specimens on each profile of the original set of Jiading Group in southern Sichuan since 1977 The south of Jiading group bottom-up into Wootoushan group,