黔北桐梓下奥陶统红花园组的苔藓动物化石新材料  

NEW BRYOZOANS FROM THE EARLY ORDOVICIAN HONGHUAYUAN FORMATION IN TONGZI COUNTY,NORTHERN GUIZHOU

作　　者：何敏 杨宇宁[1] 马俊业 张志亮 池祥日 刘静 彭庭祖 张倩倩 阳磊 HE Min;YANG Yuning;MA Junye;ZHANG Zhiliang;CHI Xiangri;LIU Jing;PENG Tingzu;ZHANG Qianqian;YANG Lei(College of Resources and Environmental Engineering,Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guizhou University,Guiyang 550025;State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008)

机构地区：[1]贵州大学资源与环境工程学院,喀斯特地质资源与环境教育部重点实验室,贵阳550025 [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

出　　处：《微体古生物学报（中英文）》2024年第3期204-218,共15页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金(42162003);贵州省人才基地项目(RCJD2018-21);贵州省科技计划(黔科合平台人才2017-5788、2023-153);中国科学院率先行动计划(202200020)共同资助。

摘　　要：提要黔北桐梓地区下奥陶统红花园组(弗洛阶)的点礁中有多样性较高的苔藓动物化石。系统古生物学分析显示,这些苔藓虫群体属于变口目和爱沙尼亚口目,共有2属4种:Orbiramus ovalis,O.minus,O.normalis和Nekhorosheviella semispherica。新化石纪录扩大了早期苔藓虫类型Orbiramus和Nekhorosheviella的地理分布和地史延限。这些模块化生长的苔藓动物化石显示出典型的包壳生物造礁构造,在红花园组点礁中以苔藓虫格架岩(bryozoan framestone)和苔藓虫-微生物粘结岩(bryozoan-microbial blindstone)参与造礁。新化石材料为探讨扬子板块早期苔藓虫的多样性演化及其造礁机制提供了关键证据。Lower Ordovician bryozoan fossils from patch reefs of the Honghuayuan Formation(Floan Stage)at the Honghuayuan section in Tongzi County,northern Guizhou are elucidated herein.Four species in two genera,i.e.,Orbiramus ovalis,O.minus,O.normalis and Nekhorosheviella semispherica,belong to the Trepostomida and the Esthonioporida are recognized,which greatly expanded the geographical and stratigraphical distribution of these early iconic bryozoans.Moreover,these modular bryozoans demonstrate typical encrusted reef-building construction,implying their contribution in the development of Early Ordovician patch reefs as bryozoan-framestone and bryozoanmicrobial blindstone from the Honghuayuan Formation.The fossil evidence from the Honghuayuan Formation shed new light on the evolutionary diversity,modular growth pattern and reef-building mechanism of the early bryozoans.

关 键 词：苔藓虫 多样性 造礁机制 红花园组 下奥陶统 贵州桐梓 

分 类 号：Q915.2[天文地球—古生物学与地层学]