• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Systematic Palaeontology >Bird tracks from the Upper Cretaceous Cantwell Formation of Denali National Park, Alaska, USA: a new perspective on ancient northern polar vertebrate biodiversity
【24h】

Bird tracks from the Upper Cretaceous Cantwell Formation of Denali National Park, Alaska, USA: a new perspective on ancient northern polar vertebrate biodiversity

机译：美国阿拉斯加德纳利国家公园上白垩统坎特维尔地层的鸟类轨迹：古代北极脊椎动物生物多样性的新观点

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Upper Cretaceous Cantwell Formation in Denali National Park and Preserve (DENA), Alaska, contains an unparalleled fossil avian biodiversity. The Cantwell Formation, thousands of metres thick, was deposited near its current latitude and is exposed throughout much of DENA and elsewhere in the central Alaska Range. The Formation comprises a lower, dominantly fluvial sedimentary unit and an upper, mostly volcanic unit. Sedimentation of the lower unit was mainly in alluvial fan, braided and meandering stream, and lacustrine environments, with possible marginal-marine influence at times. Pollen data suggest that these sedimentary rocks are late Campanian or early Maastrichtian in age; thus the Cantwell Formation is correlative with other well-known dinosaur localities in Alaska. Bird tracks are preserved in multiple locations along a 40-km transect in DENA in fluvial and lacustrine deposits. Some bird tracks are found in association with dinosaur tracks and others are found on beds interbedded with dinosaur track-bearing layers. The approximate body sizes of the birds based on tracks show a range from sparrow- to heron-sized birds (~25-30% larger than the modern Sandhill Crane Grus canadensis). The Cantwell Formation contains footprints assigned to several ichnotaxa found in either Asia or North America based on such morphological criteria as the presence or absence of a hallux, print size and shape, and angle of divarication: Aquatilavipes swiboldae, Ignotornis mcconnelli, Magnoavipes denaliensis sp. nov., Gruipeda vegrandiunus sp. nov. and Uhangrichnus chuni. The presence of a mixed Asian and North American ichnofauna suggests that at least some birds used Alaska as a bridge between Asia and North America. This diverse assemblage of avian traces, combined with the known fossil bone record and invertebrate trace fossil record, demonstrates that the northern Late Cretaceous polar region contained significant biodiversity.
机译：阿拉斯加德纳利国家公园和自然保护区（DENA）的上白垩统Cantwell组包含无与伦比的化石禽类生物多样性。厚度为数千米的Cantwell地层沉积在其目前的纬度附近，并在DENA的大部分地区以及阿拉斯加山脉中部的其他地区暴露。该地层包括下部河流为主的沉积单元和上部火山为主的单元。下层单元的沉积主要在冲积扇，辫状曲折的河道和湖泊环境中，有时可能受到边缘海洋的影响。花粉数据表明，这些沉积岩的年龄为Campanian晚期或Maastrichtian早期。因此，坎特韦尔组与阿拉斯加其他著名的恐龙地区相关。在DENA的河床和湖床沉积物中，沿40公里断面的多个位置都保留了鸟类的踪迹。发现一些鸟类的踪迹与恐龙的踪迹有关，而其他的鸟类踪迹则发现在与恐龙的踪迹层交错的床上。根据轨迹计算，鸟类的大概体形显示了从麻雀到苍鹭大小的鸟类（比现代的Sandhill Crane Grus canadensis大约25-30％）。 Cantwell地层根据形态学标准（例如是否存在拇趾甲，印刷尺寸和形状以及分叉角），分配给在亚洲或北美发现的几种鱼纲的脚印：Aquatilavipes swiboldae，Ignotornis mcconnelli，Magnoavipes denaliensis sp。十一月，Gruipeda vegrandiunus sp。十一月还有Uhangrichnus chuni。亚洲和北美鱼类鱼类混合的存在表明至少有一些鸟类使用阿拉斯加作为亚洲和北美之间的桥梁。鸟类痕迹的这种多样的组合，再加上已知的化石骨骼记录和无脊椎动物的痕迹化石记录，表明北白垩纪极地地区具有重要的生物多样性。

著录项

  • 来源
    《Journal of Systematic Palaeontology》 |2011年第1期|p.33-49|共17页
  • 作者

    Anthony R. Fiorillo; Stephen T. Hasiotis; Yoshitsugu Kobayashi; Brent H. Breithaupt; Paul J. McCarthy;

  • 作者单位

    Museum of Nature and Science, PO Box 151469, Dallas, TX 75315, USA;

    University of Kansas, Department of Geology, 1475 Jayhawk Blvd, 120 Lindley Hall, Lawrence, KS, 66045-7613, USA;

    Hokkaido University Museum, Kita 10, Nishi 8, Kita-Ku, Sapporo, Hokkaido 060-0810, Japan;

    E812 S. 13th St., Laramie, WY82070, USA;

    'Department of Geology and Geophysics, and Geophysical Institute,University of Alaska Fairbanks, PO Box 755780, Fairbanks, AK, 99775, USA;

    Hokkaido University Museum, Kita 10, Nishi 8, Kita-Ku, Sapporo, Hokkaido 060-0810, Japan;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    beringia; avian; ichnology; high latitude; sub-arctic;

    机译：贝林西亚禽动物学高纬度亚北极;

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号