Lower Triassic bryozoan beds from Ellesmere Island, High Arctic, Canada

Polar research

Tyler W. Beatty¹  Ashton F. Embry²  Benoit Beauchamp³  Aymon Baud⁴  Charles M. Henderson⁵  Hans Arne Nakrem⁶ 

[1] Department of Geology and Geophysics, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, T2N 1N4 Canada;Department of Geology and Geophysics, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, T2N 1N4 Canada;Department of Geoscience, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, T2N 1N4 Canada;Geological Museum, Lausanne University, Quartier UNIL-Dorigny, Bâtiment Anthropole, CH-1015 Lausanne, Switzerland;Geological Survey of Canada, 3303 33rd St. NW, Calgary, Alberta, T2L 2A7 Canada;Natural History Museum, University of Oslo, PO Box 1172 Blindern, NO-0318 Oslo, NorwayCorrespondence

关键词: Arctic;    Arcticopora;    bryozoans;    Canada;    Spitsbergen;    Triassic.;   

DOI  :  10.1111/j.1751-8369.2008.00071.x

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

In the Sverdrup Basin (Canadian Arctic), the Lower Triassic Blind Fiord Formation, comprising siltstone and shale, overlies various Middle to Late Permian (post-Wordian) sedimentary units. This formation is subdivided into three members: the Confederation Point, Smith Creek and Svartfjeld members of, respectively, Griesbachian–Dienerian, Smithian–Spathian and Spathian ages. Lower Triassic bryozoan beds are known from many sections of Ellesmere Island, but have never been studied in detail. During the Early Triassic biotic recovery interval, immediately following the Permian/Triassic extinction event, only one new bryozoan genus evolved in the Boreal region: Arcticopora. The first lower Triassic bryozoan bed appears in the upper part of the Confederation Point Member, and is dated as late Dienerian. Succeeding bryozoan levels occur in the upper Smith Creek Member, and are late Smithian–early Spathian in age. Bryozoan beds occupy a similar stratigraphic position in Spitsbergen. There, they occur scattered i...

【 授权许可】

CC BY-NC