鄂东南晚二叠世菊石新材料

NEW MATERIALS OF LATE PERMIAN AMMONOIDS FROM SOUTHEASTERN HUBEI

记述的菊石采自鄂东南大冶柯家湾晚二叠世大隆组,主要产于硅质页岩、硅质岩的灰岩透镜体中,共8属11种.此区大隆组仅相当于长兴阶的上部;Meitianoceras 在本区的出现,表明此属不仅分布于长兴阶的下部,也可延伸到长兴阶的上部.整个大隆组的化石,以自游生物为主,底栖类型很少.菊石中壳体大、壳面肋瘤发育者数量少,而壳饰弱、个体小者大量繁盛,呈现高丰度、低分异度的特点.保存化石的灰岩透镜体中具星散状的黄铁矿.本区晚二叠世晚期处于局部封闭的海湾环境.

The ammonoids described in the present paper were collected from the Late Permian Talong Formation in Daye, southeastern Hubei. They are assigned to 11 species in 8 genera including 2 new genera and 8 new species, namely Pseudogastrioceras sp., Neoaganides costatus sp. nov., N. laevigatus sp. nov., Sabaliceras wangrenense gen. et sp. nov., Meilianoceras sphaelobatum sp. nov, M. paulum sp. nov., Wangrenoceras rotalarium gen. et sp. nov., Pleuronodoceras dayenense sp. nov., Rotodiscoceras hubeiense sp. nov, Pseudotirolites chaotianensis Wang, and Pleuronoloeeras multinodosum Chao et Liang. In this region, the Changhsingian ammonoids are dominated by the Xinodiscaceae.