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Taxonomy and biostratigraphy of Middle Jurassic ammonites, western and central British Columbia.

机译:不列颠哥伦比亚省西部和中部中侏罗纪炸药的分类学和生物地层学。

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摘要

Ammonites from north-central British Columbia and the Queen Charlotte Islands are discussed, including a Bajocian fauna dominated by Sonninidae, from the Smithers Formation (Ashman Ridge), and the shale-tuff member, Graham Island Formation (Queen Charlotte Islands), and a Bathonian-Lower Callovian fauna dominated by East Pacific and Boreal taxa from the Smithers and Ashman formations at Ashman Ridge, Tenas Creek, and Zymoetz (Copper) River.; The Smithers Formation at Ashman Ridge contains taxa representative of the East Pacific Parabigotites crassicostatus Zone, Zemistephanus richardsoni Subzone of the Stephanoceras (Skirroceras) kirschneri Zone, and Chondroceras oblatum Zone. The Smithers Formation at Tenas Creek is younger and contains a unique association of apparently long-ranging forms.; The shale-tuff member contains taxa representative of the ?Docidoceras widebayense Zone and the P. crassicostatus Zone.; Ashman Formation faunas contain associations of taxa previously regarded as representative of several distinct faunal associations. The faunas described here only allow for broad correlation with the Arcticoceras cranocephaloides to Cadoceras apertum zones.
机译:讨论了不列颠哥伦比亚省中北部和夏洛特皇后群岛的炸药,其中包括由史密瑟斯组(阿什曼岭)的桑尼尼达克人主导的巴约人动物群,以及页岩凝灰岩成员格雷厄姆岛组(夏洛特皇后群岛),以及由东太平洋和北方类群控制的巴生统-下卡洛维动物群,分别来自阿什曼岭,特纳斯河和齐默茨(铜)河的史密瑟斯和阿什曼地层。 Ashman Ridge的Smithers组包含代表东太平洋 Parabigotites crassicostatus 区, Stephanoceras Skirroceras < / italic>) kirschneri 区域和 Chondroceras oblatum 区域。 Tenas Creek的Smithers编队较年轻,并且包含着很长一段时间的独特形式。页岩凝灰岩成员包含代表? Docidoceras widebayense 区域和 P的分类单元。 crassicostatus 区域。阿什曼组动物群包含以前被认为是几种不同动物群代表的生物分类群。此处描述的动物区系仅与 Crticoceras cranocephaloides Cadoceras apertum 区具有广泛的相关性。

著录项

  • 作者

    Johnston, Kevin Kingswood.;

  • 作者单位

    University of Calgary (Canada).;

  • 授予单位 University of Calgary (Canada).;
  • 学科 Paleontology.
  • 学位 M.Sc.
  • 年度 2002
  • 页码 266 p.
  • 总页数 266
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 古生物学;
  • 关键词

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