检索结果-南通市图书馆

A New Species of Septuconularia(Hexangulaconulariidae,Cnidaria)from cambrian stage 2,South China

Acta Geologica Sinica(English Edition) 2022年第3期96卷 757-765页

作者： SONG Zuchen GUO Junfeng HAN Jian Heyo VAN ITEN QIANG Yaqin PENG Jiaxin SUN Jie ZHANG Zhifei Key Laboratory of Western Mineral Resources and Geological Engineering Ministry of EducationSchool of Earth Science and ResourcesChang’an UniversityXi’an 710054China Shaanxi Key Laboratory of Early Life and Environments Department of GeologyNorthwest UniversityXi’an 710069China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and PaleoenvironmentChinese Academy of SciencesNanjing 210008China Department of Geology Hanover CollegeHanoverIndiana 47243USA Department of Invertebrate Paleontology Cincinnati Museum Center1301 Western AvenueCincinnatiOhio 45203USA

Hexangulaconulariids,an extinct family of medusozoan small shelly fossils(SSFs),were a conspicuous component of early cambrian,shallow marine platform communities in South *** herein is Septuconularia crassiformis *** Bed 5 of the Yanjiahe Formation(cambrian stage 2)in the Three Gorges area of Hubei *** new species differs from the type and only other known species,***,in the shape of the abapical portion and in the degree of curvature of the adapertural *** anatomy of the apical portion of the new species is *** diagnosis of the genus Septuconularia is emended and the spatio-temporal distribution of hexangulaconulariids in South China is ***,***,with its slit-like aperture and very narrow transverse cross-section,may have been better adapted to the shallow platform environment than the broader ***,which appears to have been less common than the type species.

关键词： Septuconularia crassiformis hexangulaconulariids cambrian stage 2 Yanjiahe Formation South China

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Early cambrian Mollusc Watsonella crosbyi:A Potential GSSP Index Fossil for the Base of the cambrian stage 2

引用

Acta Geologica Sinica(English Edition) 2011年第2期85卷 309-319页

作者： LI Guoxiang ZHAO Xin Alexander GUBANOV ZHU Maoyan NA Lin State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and Palaeontologythe Chinese Academy of Sciences Nanjing 210008 China CASP Department of Earth Sciences University of Cambridge Cambridge UK

The mollusc Watsonella crosbyi was studied on the basis of material from the lower cambrian Dahai Member of the Zhujiaqing Formation in eastern Yunnan, China and the Pestrotsvet Formation of the Aldan River region in the Siberian Platform. This fossil had been excessively described under different names in the literature, such as Heraultia varensalensis Cobboid, 1935, H. sibirica Missarzhevsky, 1974, Heraultipegma yunnanensis He and Yang, 1982, H. yannanese He and Yang,1982, Watsonella yunnanensis, W. crosbyi Grabau, 1900, etc. Taxonomic revision shows that other species are junior synonyms of W. crosbyi. Analysis of functional morphology implies that W. crosbyi may be rather a heicionelloid than a rostroconch since its univalved conch is untorted endogastric and lacks a rostrum and a true internal pegma. Replicas of the original microstrnctures preserved on the surfaces of phosphatic internal moulds confirm that the shell consists of two layers. The inner layer is lamello-fibrillar, and the outer layer is spherulitic prismatic. The widespread geographical occurrences in both siliciclastic and carbonate rocks of the late Terreneuvian indicate that W. crosbyi is an important index fossil for global correlations and subdivision of the cambrian Series I （Terreneuvian）.The first appearance datum （FAD） of W. crosbyi is suggested to be a potential GSSP （Global Boundary Stratotype Section and Point） candidate marker for defining the base of the cambrian stage 2.

关键词： mollusc Watsonella crosbyi microstructure Terreneuvian cambrian stage 2 South China Siberian Platform

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：