黔南晚二叠世深水相地层及双壳类动物群

根据生态环境和沉积环境的差异 ,黔南晚二叠世生物群和地层可分出两种类型 :“浅海台地型”和“次深海裂陷槽型”,后者为深水型。简述了深水相地层的特征 ,据地层内所含化石确证了地层时代 ;据所含菊石、遗迹化石及围岩的沉积特点和类型 ,证实研究区晚二叠世时为深水环境 ;较系统地研究了黔南晚二叠世深水相双壳类动物群 ,它们的特征为薄壳、壳体较小、个体数量多、壳表以光滑和同心饰为主。化石中以 Claraia,H unanopecten最为发育 ,建立了 H u-nanopecten exilis-Claraia primitiva组合 ,并与国内同期的双壳类组合进行了比较。

Late Permian deep water strata and bivalves of south Guizhou

According to the ecologic and sedimentary features, the Late Permian biota and strata of south Guizhou can be grouped into the “shallow platform type”and “sub byssal aulacogen type”.Detailed studies on the fossils(such as ammonoid and trace fossils) yielding in the strata and the country rocks reveal that the strata were Late Permian deep water sediments. Late Permian deep water bivalves with small thin shells and smooth and concentric ornaments are well developed in south Guizhou, among which Claraia and Hunanopecten share the most, Hunanopecten exilis Claraia primitiva assemblage is set up, and it can be correlated with the other coeval bivalves assemblages.