Explaining the exceptional preservation of Ediacaran rangeomorphs from Spaniard's Bay, Newfoundland: A hydraulic model
Explaining the exceptional preservation of Ediacaran rangeomorphs from Spaniard's Bay, Newfoundland: A hydraulic model
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DOI：
10.1016/j.precamres.2013.03.013
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发表时间：
2013-07-01
影响因子：
3.8
通讯作者：
Wacey, David
中科院分区：
文献类型：
--
作者：
Brasier, Martin D.;Liu, Alexander G.;Wacey, David
在纽芬兰西班牙湾的一个层面上发现了埃迪卡拉纪范围型化石的特殊三维保存。这种高质量的保存以前被解释为夹带的生物体内的TD-E泥岩部门的远端浊积岩，其次是包裹在结核。我们的沉积学和埋藏学分析揭示了这些化石与侵蚀性单向流动证据之间的明确联系，包括冲刷痕迹，工具痕迹，脊槽痕迹，分离线理和当前新月形。我们提出了一个可供选择的事件序列，大致如下：（i）在平面层状粉砂沉积期间，rangeomorph圆盘被锚定在海底（我们的单元2，
Exceptional 3-D preservation of Ediacaran rangeomorph fossils is found on a single bedding plane at Spaniard's Bay, Newfoundland. This high-quality preservation has previously been explained by entrainment of organisms within the Td-e mudstone division of a distal turbidite, followed by encasement within concretions. Our sedimentological and taphonomic analysis reveals a clear association between these fossils and evidence for erosive unidirectional flows, including scours marks, tool marks, ridge-and-groove marks, parting lineations and current crescents. We suggest an alternative sequence of events that runs broadly as follows: (i) rangeomorph discs were anchored to the seafloor during deposition of planar laminated silts (our unit 2,