Late Jurassic ammonite evolution and paleoenvironment of the Russian Platform  

作　　者：MITTA Vasily 

机构地区：[1]Paleontological Institute, Russian Academy of Sciences, Moscow 117997, Russia

出　　处：《Science China Earth Sciences》2009年第12期2024-2028,共5页中国科学（地球科学英文版）

基　　金：Supported by Program of the Presidium of the Russian Academy of Sciences "Origin of the Biosphere and the Evolution of Geo-biological Systems"

摘　　要：The stratigraphic record shows a considerable decrease in ammonoid taxonomic diversity and distinct changes of ammonite shell morphology toward end of the Jurassic in the Central Russian Basin. By the end-Volgian, ammonites were represented by only two genera, belonging to a single family Craspeditidae, which differ markedly from previous ammonite families in their shell form. The end-Jurassic decrease in ammonoid biodiversity started in the mid-Volgian and is mainly correlated with shallowing of the shelf.The stratigraphic record shows a considerable decrease in ammonoid taxonomic diversity and distinct changes of ammonite shell morphology toward end of the Jurassic in the Central Russian Basin. By the end-Volgian, ammonites were represented by only two genera, belonging to a single family Craspeditidae, which differ markedly from previous ammonite families in their shell form. The end-Jurassic decrease in ammonoid biodiversity started in the mid-Volgian and is mainly correlated with shallowing of the shelf.

关 键 词：Volgian Ryazanian AMMONITES BIODIVERSITY RUSSIAN PLATFORM 

分 类 号：Q915[天文地球—古生物学与地层学]