10 research outputs found
Historical distribution patterns of trigonioidids (non-marine Cretaceous bivalves) in Asia and their palaeogeographic significance
The non-marine trigonioidid bivalves show five phases of radiation in the Cretaceous of Pal-Asia: pre-Aptian (?Valanginian/HauterivianâBarremian), Aptian, Albian, Cenomanian and TuronianâMaastrichtian. Their distribution patterns show two distinct palaeo-river systems feeding trigonioidids. Before the Cenomanian, the river system occupied the southwesternâsouthernâsoutheastern Pal-Asian continental margin areas. During the TuronianâMaastrichtian, it extended along the line of southcentral Chinaâeastern Chinaânortheastern Chinaânorthern China and Mongoliaânorthwestern Chinaâeastern Fergana Basin of Kyrgyzstanâwestern Tajikistan Basin of TajikistanâTashkent area of Kazakhstanâcentral Kyzylkum of northern UzbekistanâAral Sea area of Kazakhstan. Furthermore, the general trigonioidid distribution pattern demonstrates that Japan was probably attached to part of eastern China and/or Korea during the ?Valanginian/HauterivianâCenomanian stages