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Impact of Sauropod Dinosaurs on Lagoonal Substrates in the Broome Sandstone (Lower Cretaceous), Western Australia

机译:蜥脚类恐龙对西澳大利亚布鲁姆砂岩(下白垩统)中泻湖基质的影响

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摘要

Existing knowledge of the tracks left by sauropod dinosaurs (loosely ‘brontosaurs’) is essentially two-dimensional, derived mainly from footprints exposed on bedding planes, but examples in the Broome Sandstone (Early Cretaceous) of Western Australia provide a complementary three-dimensional picture showing the extent to which walking sauropods could deform the ground beneath their feet. The patterns of deformation created by sauropods traversing thinly-stratified lagoonal deposits of the Broome Sandstone are unprecedented in their extent and structural complexity. The stacks of transmitted reliefs (underprints or ghost prints) beneath individual footfalls are nested into a hierarchy of deeper and more inclusive basins and troughs which eventually attain the size of minor tectonic features. Ultimately the sauropod track-makers deformed the substrate to such an extent that they remodelled the topography of the landscape they inhabited. Such patterns of substrate deformation are revealed by investigating fragmentary and eroded footprints, not by the conventional search for pristine footprints on intact bedding planes. For that reason it is not known whether similar patterns of substrate deformation might occur at sauropod track-sites elsewhere in the world.
机译:蜥脚类恐龙(松散的“雷龙”)留下的轨迹的现有知识基本上是二维的,主要是从暴露在层理平面上的足迹中得出的,但是西澳大利亚州的布鲁姆砂岩(早白垩世)中的示例提供了补充的三维图显示走动的蜥脚类动物可能在多大程度上变形其脚下的地面。蜥脚类动物穿越布鲁姆砂岩的薄层泻湖沉积物所产生的变形模式在范围和结构复杂性方面都是前所未有的。在单个人行脚下的一堆传播的浮雕(底纹或鬼纹)被嵌套成一个层次更深,更具包容性的盆地和低谷,最终达到较小的构造特征。最终,蜥脚类动物的追踪者使基底变形到一定程度,以至于他们改变了所居住景观的地形。通过研究碎片和侵蚀的足迹,而不是通过在完整的铺垫平面上常规搜索原始足迹的方法,可以揭示这种基板变形的模式。因此,尚不清楚在世界其他地方的蜥脚类动物的追踪地点是否会发生类似的基板变形模式。

著录项

  • 期刊名称 PLoS Clinical Trials
  • 作者

    Tony Thulborn;

  • 作者单位
  • 年(卷),期 2009(7),5
  • 年度 2009
  • 页码 e36208
  • 总页数 22
  • 原文格式 PDF
  • 正文语种
  • 中图分类
  • 关键词

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