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贵州剑河中寒武世中期甲劳组水母状化石的发现

ISSN号：0001-6616
期刊名称：《古生物学报》
时间：0
分类：Q911.28[天文地球—古生物学与地层学;生物学—古生物学]
作者机构：[1]贵州大学资源与环境工程学院,贵阳550003, [2]现代古生物学和地层学国家重点实验室,中国科学院南京地质古生物研究所,南京210008
相关基金：国家自然科学基金（Nos.40372023,40672018,40232020）、中国科学院资源环境领域知识创新工程重要方向项目（KZCX3-SW-141）、973项目（2006CB806401）及贵州大学博士启动基金项目资助课题.致谢贵州大学彭进副教授及2001级资勘班本科生吴文明、饶江和龙成雄参与测制剖面,中国科学院南京地质古生物研究所袁金良研究员提供有益建议,陈周庆工程师摄制图片,在此一并致谢.标本存放于贵州大学资源与环境工程学院古生物及成矿研究所.

作者：杨兴莲[1], 朱茂炎[2], 赵元龙[1], 毛永琴[1], 王宇轩[1]

关键词：水母状化石Eldoniidae, 甲劳组, 中寒武世中期, 贵州剑河八郎, Eldoniidae, Jialao Formation, middle Cambrian, Jianhe, Guizhou

中文摘要：

贵州剑河革东镇八郎村南甲劳组中部钙质白云岩中新近发现的具有粗强放射状辐管的水母状化石和其下凯里组中具细辐管及同心环的拟轮盘水母（Pararotadiscus）有明显区别,属于伊尔东钵科（Eldoniidae）。其层位晚于中寒武世早期凯里生物群中拟轮盘水母（Pararotadiscus）层位1个化石带,属中寒武世中期,是该类化石在中国的最高层位,相当于北美布尔吉斯页岩生物群中Eldonia化石层位。

英文摘要：

Medusiform eldoniids, which are a group of pelagic animals with coiled alimentary canal and tentacles, are confined to the Cambrian, especially in lower to middle Cambrian of Poland, Spain, Siberia, North America and South China, etc. Eldoniids are one of important components of the three Burgess Shale-type hiotas, including the Chengjiang Biota, Kaili Biota and Burgess Shale Biota. Here we describe a medusiform fossil from the middle Cambrian Jialao Formation at Balang village, Gedong Town, Jianhe County, Guizhou Province. Although the fossil has the similar features as eldoniids with bifurcated lobes, the poor preservation of a single specimen makes it premature to assign it to a genus or species. The undefined genus and species is discoid in shape with 32-36 rough radial lobes. The fossil horizon is about 1 fossil zone above that of Pararotadiscus guizhouensis from the Kaili Biota. Based on the study of trilobites, the geological age is middle middle Cambrian. It is the highest horizon of eldoniids in China. In the past, the exceptional preservation of soft-bodied fossils was often discovered in the mudstone, and was infrequent in the carbonate. Thus this occurrence in the Jialao Formation is an important evidence of soft-bodied fossils in the carbonate. The medusiform fossil reported here provides new information of the Cambrian life.

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