中国非海相中生代双壳类与地层的分布及发展

根据已有资料,将我国非海相中生代双壳类化石分为5个化石群和一些小群,发现它们之间的变化在侏罗纪与白垩纪间最显著。并发现,我国早年的下白垩统多为侏罗系,早白垩世的闽浙运动较晚期中侏罗世的宁镇运动显得重要;闽浙运动和早白垩世晚期的上升运动一起,与国际间近年“白垩纪中事件”研究的结果基本符合。     

DISTRIBUTION AND DEVELOPMENT OF NONMARINE MESOZOIC BIVALVES AND FORMATIONS IN CHINA

In this paper the author reviews the available materials on the nonmarine Mesozoicbivalves in China and divides these fossils into five faunas and sevoral faunules according totheir geologic ages. Their distributions are briefly summarized. The Early Cretaceous orTPN (Trrgonioides -Plicatounio -Nippononaia ) fauna marks the greatest event and vicissitude inthe developmental history of these faunas. Besides the subdivision and correlation of the nonmarine Mesozoic in China with the aidof these foasil bivalves the stratigraphical development and some phases of the Indosinian andYanshanian tectonic cycles are briefly discussed and chronologically dated. The Early Cre-taceous Mincheian movement is considered to play a more hoportant role than the latest MiddleJurassic Ningchinian movement. The Mincheian with a younger uplift is essentially accordantwith the results recently reached about Mid-Cretaceous events by international geological andpaleontological studies.