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湖北武汉下志留统坟头组化石组合及沉积环境

ISSN号：1671-1505
期刊名称：古地理学报
时间：0
页码：-
分类：Q911.6[天文地球—古生物学与地层学;生物学—古生物学]
作者机构：[1]中国地质大学(武汉)地球科学学院,湖北武汉430074, [2]中国地质大学生物地质与环境地质国家重点实验室,湖北武汉430074
相关基金：国家自然科学基金项目（批准号：40872001 41072252 40921062）; 国家地质学理科基地人才培养基金项目（编号：J0830520）联合资助
相关项目：重大地质突变期生物与环境协同演化

关键词：下志留统, 坟头组, 化石组合, 武汉, 沉积环境, Lower Silurian, Fentou Formation, fossil association, Wuhan, sedimentary environment

中文摘要：

文中报道了在武汉市铁箕山新发现的下志留统坟头组剖面。该剖面所在位置交通方便,出露较好,化石丰富,发现有三叶虫、腕足类、双壳类、腹足类、头足类、喙壳类、海百合、锥石、海星、鱼类及遗迹化石等,初步鉴定出13属17种。根据该剖面中的化石组合面貌及与邻区的对比认为,武汉地区坟头组的时代应为早志留世（兰多维列世）特列奇期。通过对该剖面化石组合特征、遗迹化石及其他相标志的分析,确定其下部为高能前滨环境,中上部为近滨和远滨环境。本剖面和相关化石材料及相标志的发现进一步丰富了武汉地区下志留统的生物面貌,并且为跨区域之间的地层和古环境对比提供了新资料。最后,作者建议取消武汉地区锅顶山组这一地层单位。

英文摘要：

The paper reports a new section of the Lower Silurian Fentou Formation which has been measured in Tiejishan Hill.This well-exposed section situates in the southeast of Wuhan,Hubei Province,just five kilometers from the downtown of Wuhan.Abundant fossils have been collected from this site,they were identified as 13 genera with 17 species in total,including trilobites,brachiopods,bivalves,gastropods,rostroconcha and piscis.Some of the species such as Coronocephalus wuningensis,C.gaoluoensis,Kailia intersulcata,Latiproetus sp.,Striispirifer shiqianensis,Striispirifer disparatus,Howellella sp.,Nucleospira calypta are common in the Fentou Formation of Jiangsu and Anhui Provinces,the Shamao Formation of west of Hubei Province and the Xiushan Formation in southwest China;Technophorus peregriuns has been reported from the upper part of the Xiushan Formation in Guizhou Province before,and also from both of the Wangjiawan Formation and Ningqiang Formation of Shaanxi Province.Orthonota perlata occurs frequently in the Fentou Formation in the Lower Yangtze River region.Based on biostratigraphic correlation,fossil assemblage from the Fentou Formation in Wuhan area belongs to the Early Silurian（Telychian,Llandovery）.The lower part of the Fentou Formation might be deposited in a foreshore setting with a high energy,and the middle-upper part of this formation might be formed in an inshore and offshore setting with a lower energy.At last,the authors propose to cancel the stratigraphic unit of the Guodingshan Fomation in Wuhan area.

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