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Biodiversification of Late Ordovician Hirnantia Fauna on the Upper Yangtze Platform,South China 被引量:12
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作者 ian g.percival 《Science China Earth Sciences》 SCIE EI CAS 2010年第12期1800-1810,共11页
The Hirnantia Fauna is a globally-represented,cool water brachiopod fauna that originated and flourished in shallow marine environments at intermediate to low latitudes after the first episode of the end-Ordovician ma... The Hirnantia Fauna is a globally-represented,cool water brachiopod fauna that originated and flourished in shallow marine environments at intermediate to low latitudes after the first episode of the end-Ordovician mass extinction.It was well-developed,widely distributed,long in stratigraphical range,and complex in palaeoecological differentiation on the Upper Yangtze Platform of the South China paleoplate,where it has been extensively studied.Qualitative and quantitative analyses show that the FAD of the Hirnantia Fauna in South China becomes stratigraphically higher from nearshore to offshore localities on the Yangtze Platform,while the range of the fauna becomes shorter whereas the taxonomic diversity increases.Over its stratigraphical range the diversity of the Hirnantia Fauna at nearshore localities consistently decreases,but trends in the opposite direction at offshore,deeper water localities.The fauna was represented by different communities,subcommunities or associations with changing environmental factors(such as water depth and substrate) at different localities or horizons. 展开更多
关键词 Hirnantia FAUNA biodiversification ORDOVICIAN HIRNANTIAN UPPER YANGTZE Platform South China
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Conodont Biostratigraphy of Ordovician Deep-Water Turbiditic Sequences in Eastern Australia——A New Biozonal Scheme for the Open-Sea Realm 被引量:1
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作者 Yong Yi Zhen ian g.percival +2 位作者 Phil Gilmore Jodie Rutledge Liann Deyssing 《Journal of Earth Science》 SCIE CAS CSCD 2021年第3期486-500,共15页
Ordovician conodonts representing 28 genera and 28 named and three unnamed species were identified from 740 chert and siliceous siltstone spot samples(>3000 thin sections)from deep-water turbiditic sequences of the... Ordovician conodonts representing 28 genera and 28 named and three unnamed species were identified from 740 chert and siliceous siltstone spot samples(>3000 thin sections)from deep-water turbiditic sequences of the Lachlan Orogen in central and southern New South Wales,Australia.Based on these faunas,a new conodont biozonal scheme has been established to divide the Ordovician turbiditic successions of the Lachlan Orogen into 12 superbiozones and biozones.They are(in ascending order)the Paracordylodus gracilis Superbiozone(including the Prioniodus oepiki Biozone),Periodon flabellum Superbiozone(including the Oepikodus evae Biozone in the lower part),Periodon hankensis Biozone,Periodon aculeatus Superbiozone(including the Histiodella labiosa,Histiodella holodentata,Histiodella kristinae,Pygodus serra and Pygodus anserinus biozones)and the Periodon grandis Biozone.The Pygodus anserinus Biozone is divided further into the lower and upper subbiozones.This new conodont biozonation scheme spanning the upper Tremadocian to middle Katian interval permits precise age-dating and correlation of deep-water siliciclastic rocks that characterize the Ordovician Deep-Sea Realm regionally and internationally. 展开更多
关键词 CONODONTA Ordovician System correlation deep-water biofacies PALEOBIOGEOGRAPHY
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华南上扬子区晚奥陶世赫南特贝动物群的时空演变 被引量:23
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作者 詹仁斌 刘建波 +2 位作者 ian g.percival 靳吉锁 李贵鹏 《中国科学:地球科学》 CSCD 北大核心 2010年第9期1154-1163,共10页
赫南特贝动物群是奥陶纪末大灭绝事件第一幕发生之后,在全世界中、低纬度地区正常浅海底域广泛兴起的一个典型的凉水腕足动物群,已知在全世界除澳洲以外的各大洲数十个国家和地区见诸报道.华南上扬子区是赫南特贝动物群最为发育、分布... 赫南特贝动物群是奥陶纪末大灭绝事件第一幕发生之后,在全世界中、低纬度地区正常浅海底域广泛兴起的一个典型的凉水腕足动物群,已知在全世界除澳洲以外的各大洲数十个国家和地区见诸报道.华南上扬子区是赫南特贝动物群最为发育、分布最广泛、地质延限最长、生态分异最复杂的地区.定性与定量分析显示,赫南特贝动物群在扬子区从近岸至远岸的一系列产地,首现层位逐渐升高,动物群延续时限越来越短,而多样性却越来越高.纵向考察表明,近岸产地的赫南特贝动物群多样性由高向低演变,而远岸较深水产地的多样性演变则由低而高.随地点和层位而发生的环境因子变化(如水深、底质等),赫南特贝动物群应对以不同的群落、亚群落或群集. 展开更多
关键词 赫南特期 观音桥组 赫南特贝动物群 华南扬子区
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