朱杨格,刘丽静,贾连奇,沈锦文,甘德祥

• 1:西北大学地质学系
• 2:大陆动力学国家重点实验室
• 3:早期生命与环境陕西省重点实验室

摘要(Abstract)：

古杯动物是寒武系第二阶至第四阶生物地层划分和对比的重要化石。前人已在福成、新潮、十里溪、岩孔及王家坪剖面的地层中建立了5个古杯动物化石带(层),但是扬子地台其他地区古杯动物化石带仍未建立,各地区之间的古杯生物地层对比存在困难。笔者在陕西勉县发现了一个新的产古杯动物化石的寒武系剖面——黑滩沟剖面,对郭家坝组顶部钙质结核和仙女洞组非礁相灰岩中的古杯动物化石进行了详细研究,共鉴定出7属7种和2个未定属种,包括1个新属新种Shaanxicyathus spinosus gen.et sp.nov.。黑滩沟剖面仙女洞组的中下部地层中可识别出2个古杯动物化石带,自下至上为:Dailycyathus dubius带和Shaanxicyathus spinosus-Archaeopharetra tabulates组合带。Dailycyathus dubius带与扬子地台第一个古杯动物化石带(福成剖面仙女洞组的Dailycyathus xiuqiensis带)相当,Shaanxicyathus spinosus-Archaeopharetra tabulates组合带与其第二个古杯动物化石带(福成剖面仙女洞组的Dictyocyathus shaanxiensis带)相当。黑滩沟剖面与福成剖面第一个古杯动物化石带的底界均为仙女洞组的底界,因此黑滩沟剖面与福成剖面的仙女洞组底界相当。黑滩沟剖面古杯动物化石带的建立为扬子地台不同地区仙女洞组的地层对比提供了新依据。

关键词(KeyWords)： 古杯动物;第二统;仙女洞组;扬子地台;汉南—米仓山地区;生物地层

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(42072127、41930319、41972143、42272006);; 国家重点研发计划(2023YFF0803600)共同资助

作者(Author): 朱杨格,刘丽静,贾连奇,沈锦文,甘德祥

DOI: 10.19839/j.cnki.dcxzz.2024.0021

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