| 新疆莎车地区晚白垩世横裂甲藻和疑源类 |
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| 引用本文：余静贤,张望平.1980.新疆莎车地区晚白垩世横裂甲藻和疑源类[J].地球学报,2(1):93-119. |
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| 中文摘要:<正> 一、前言 新疆莎车地区上白垩统出露完整,为一套海相与泻湖相沉积,含丰富的孢粉及海相横裂甲藻与疑源类,因限于篇幅,本文着重讨论横裂甲藻与疑源类,孢粉部份另行发表。 近十多年来,国外已广泛用横裂甲藻与疑源类作为划分地层、寻找石油和探讨古地理的重要手段之一。白垩纪海相横裂甲藻,我国还是首次报道,本文将通过对上白垩统英吉沙群浮游横裂甲藻及疑源类组合的分析,来探讨其地质时代、地层划分及古生态特点。 文中共鉴定了横裂甲藻42个属、93个种,其中描述了贝个新属、14个新种、1个新变种。疑源类鉴定7个属,6个种。 |
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| UPPER CRETACEOUS DINOFLAGELLATE CYSTS AND ACRITACHS OF WESTERN XINJIANG |
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| Abstract:In this paper ninty-three species of Dinoflagellate cysts and six species ofAcritarchs are reported for the Yingjisha Group (Upper Cretaceous) of We-stern Xinjiang. One new genus (Hashenia gen. nov.), fourteen new species and one vari-ety of Dinoflagellate cysts are described. Three cysts assemblages zones may be differentiated from the YingjishaGroup as follow: 1. Cyclonephellum vannophorum-Canniagia colliveri assemblage zone ofCenomanian-Early Turonian in age. 2.Palaeohystrichophora infusorioides-Spiniferites ramosus var. ramosus assemblage zone of Turonian-Santonian in age. 3.Deflandrea microgranulate-Operculodinium baculatum assemblage zone of Campanian-Early Masstrichtian in age. The first and second assemblage zones indicate open marine sediments, where as the third assemblage zone reflects a neritic or lagoon facies. The Plankton assemblages of the Yingjisha Group are dominated by Chorte cysts, while the member of Deflandrea group are relatively rare, thus indicating rather warm water for their deposition and belonging to Tethyan province in biogeography. |
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