滇西景星组双壳类动物群的固有属性

滇西景星双壳类是以Ｐｅｇｒｉｎｏｃｏｎｃｈａ－Ｓｉｎｏｎａｉａ－Ｋｏｒｅａｎａｉａ－Ｅｏｎｉｐｐｏｎｏｎａｉａ－Ｐｌｉｃａｔｏｕｎｉｏ为代表的地方性动物群，属非海生类三角蚌类系统演化的早白垩世产物，景星组属于亚洲地方性的非海相三分白垩系的下白垩统，可与滇中的高峰寺组－普昌河组，青海南部的雁石坪群上段（扎窝茸组）和藏东的多尼组对比，该组双壳类曾被误认为晚株罗世海生物群，是因为Ｓｉｎｏｎａｉａ和Ｅｏｎ

ON THE INNANTE ATTRIBUTE OF THE BIVALVE FAUNA OF THE JINGXINAG FORMATION FROM WEST YUNNAN

The bivalve fauna represented by Peregrinoconcha-Sinonaia-Koreanaia-Eonippo-nonaia-Plicatounio from the Jingxing Formation of west Yunnan is a famous endemic fauna It is pointed out that the fauna belongs to Early Cretaceous phylogenetic products of the nonmarine trigonioidaceans The Jingxing Formation is the Lower Cretaceous (Neocomian) of the Asian endemic nonmarine tripartite Cretaceous It can be correlated with the Gaofengsi and Puchanghe formations in central Yunnan, the upper member (Zhaworong Formation) of the Yanshiping Group in south Qinghai and the Duoni Formation in east Tibet The bivalves of the Jingxing Formation were misunderstood to be the marine Late Jurassic fauna because Sinonaia and Eonippononaia were misidentified with Goniomya , Nakamuranaia with Quenstedtia, Tancredia and Anisocardia,Yunnanoconcha with Pleuromya and Mytilus with Falcimytilus and Lycettiea The most improtant representative Peregrinoconcha , which is distributed in west central Yunnan, south Qinghai and east Tibet, was mistaken for Vaugonia and Syrotrigonia before This misidentification is the important cause misunderstangding the bivalves of the Jingxing Formation as a marine Late Jurassic fauna In fact, Peregrinoconcha belongs to trigonioidaceans as it is fundamentally the same as Wakinoa in interior morphology