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The ups and downs ofDiplocraterionin the Glen Rose Formation (Lower Cretaceous), Dinosaur Valley State Park, Texas (USA)
Geodinamica Acta Pub Date : 2015-05-14 , DOI: 10.1080/09853111.2015.1037151
Anthony J. Martin , Michael Blair , Benjamin F. Dattilo , Sadye Howald , James O. Farlow

Diplocraterion, a U-shaped burrow attributed to infaunal invertebrates, is normally a shallow-marine trace fossil and not part of a continental vertebrate ichnoassemblage. Hence, the Glen Rose Formation (Aptian–Albian) of Texas (USA) presents an opportunity to study Diplocraterion associated with a world-class dinosaur tracksite. Most Diplocraterion are in a bioclastic wackestone–packstone bed just above the Taylor Tracklayer, a significant dinosaur track horizon. Diplocraterion are consistently sized, but with variable depths; most have protrusive spreiten and northeast–southwest trends. Smaller Arenicolites co-occur with Diplocraterion, and other trace fossils include Rhizocorallium and a large theropod trackway. Based on our analysis, a sea-level rise buried the Taylor Tracklayer, with a shallow-marine carbonate mud colonised by Diplocraterion and Arenicolites tracemakers. Protrusive Diplocraterion, eroded burrow tops, Rhizocorallium, and other criteria point towards firming and net erosion of the bed caused by a stillstand. The depositional environment of the Diplocraterion bed was possibly a subtidal lagoon that covered shoreward sediments impacted by large theropods. Burrow orientations suggest bidirectional currents consistent with trends of theropod trackways, implying each were controlled by a shoreline. The results of our study demonstrate how marine invertebrate and continental vertebrate trace fossils can be used together to define fine-scale changes in former carbonate shorelines.

中文翻译:

得克萨斯州恐龙谷州立公园(美国)Glen Rose 组(下白垩纪)Diplocraterionin 的起伏

Diplocraterion 是一个 U 形洞穴,归因于下层无脊椎动物,通常是浅海遗迹化石,而不是大陆脊椎动物 ichnosemblage 的一部分。因此,德克萨斯州(美国)的 Glen Rose 组(Aptian-Albian)提供了一个研究与世界级恐龙足迹相关的双角龙的机会。大多数 Diplocraterion 位于 Taylor Tracklayer 正上方的生物碎屑碎屑石 - 碎石床中,这是一个重要的恐龙足迹地平线。Diplocraterion 大小一致,但深度不同;大多数有突出的 spreiten 和东北-西南趋势。较小的砗磲石与双角龙共生,其他痕迹化石包括根珊瑚和一条大型兽脚亚目动物轨道。根据我们的分析,海平面上升掩埋了 Taylor Tracklayer,浅海碳酸盐泥被 Diplocraterion 和 Arenicolites 示踪剂殖民。突出的 Diplocraterion、侵蚀的洞穴顶部、Rhizocorallium 和其他标准表明由静止架引起的床的坚固和净侵蚀。Diplocraterion 床的沉积环境可能是一个潮下泻湖,覆盖了受大型兽脚类动物影响的海岸沉积物。洞穴方向表明双向流与兽脚类动物轨道的趋势一致,这意味着每个流都由海岸线控制。我们的研究结果展示了如何将海洋无脊椎动物和大陆脊椎动物痕迹化石一起使用来定义前碳酸盐海岸线的精细变化。和其他标准指向由静止架引起的床的坚固和净侵蚀。Diplocraterion 床的沉积环境可能是一个潮下泻湖,覆盖了受大型兽脚类动物影响的海岸沉积物。洞穴方向表明双向流与兽脚类动物轨道的趋势一致,这意味着每个流都由海岸线控制。我们的研究结果展示了如何将海洋无脊椎动物和大陆脊椎动物痕迹化石一起使用来定义前碳酸盐海岸线的精细变化。和其他标准指向由静止架引起的床的坚固和净侵蚀。Diplocraterion 床的沉积环境可能是一个潮下泻湖,覆盖了受大型兽脚类动物影响的海岸沉积物。洞穴方向表明双向流与兽脚类动物轨道的趋势一致,这意味着每个都由海岸线控制。我们的研究结果展示了如何将海洋无脊椎动物和大陆脊椎动物痕迹化石一起使用来定义前碳酸盐海岸线的精细变化。暗示每个都由海岸线控制。我们的研究结果展示了如何将海洋无脊椎动物和大陆脊椎动物痕迹化石一起使用来定义前碳酸盐海岸线的精细变化。暗示每个都由海岸线控制。我们的研究结果展示了如何将海洋无脊椎动物和大陆脊椎动物痕迹化石一起使用来定义前碳酸盐海岸线的精细变化。
更新日期:2015-05-14
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