Textured organic surfaces associated with the Ediacara biota in South Australia
Textured organic surfaces associated with the Ediacara biota in South Australia
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DOI：
10.1016/j.earscirev.2009.03.002
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发表时间：
2009-10-01
影响因子：
12.1
通讯作者：
Droser, Mary L.
中科院分区：
文献类型：
--
作者：
Gehling, James G.;Droser, Mary L.
埃迪卡拉纪（Ediacaran Period）得名于埃迪卡拉生物群（Ediacara biota）的化石，它代表了化石记录中首次出现的大型和多样化的生物组合。虽然这些独特的身体化石的全球记录现在是众所周知的，以前未被识别的宏观有机质记录的纹理有机表面（TOS）发生在埃迪卡拉生物群。然而，TOS在更广泛的古环境背景下也是一个特征，在那里身体化石是未知的，在埃迪卡拉纪硅质岩序列中，已经在澳大利亚，纳米比亚和北美西部进行了研究。揭示了TOS代表埃迪卡拉生物群的床面组合中最常见的有机特征。TOS包括保存，纹理有机垫，纤维和简单的管状体化石的图案组合。复杂的Ediacara身体化石，而其独特的身体计划，并占主导地位的一些床，是相对较小的组成部分，总表面积。TOS的许多元素以前被误诊为遗迹化石，实际上仅限于两种或最多三种形态类型，表明存在Bilateria。虽然TOS代表了一个简单的等级的器官结构比离散和更复杂的埃迪卡拉身体化石，他们以类似的方式保存。连续表面之间的生物群的所有组成部分的显着变化表明，埃迪卡拉生态波动在短时间内，尽管明显一致的沉积制度。(C)2009 Elsevier B.V.保留所有权利。
The Ediacaran Period takes its name from the fossils of the Ediacara biota, which represent the first appearance of large and diverse assemblages of organisms in the fossil record. Although the global record of these distinctive body fossils is now well known, a previously unrecognized megascopic organic record of textured organic surfaces (TOS) occurs in the Ediacara biota. However, TOS is also a feature over a wider range of paleoenvironmental settings, where body fossils are unknown, in Ediacaran siliciclastic successions that have been studied in Australia, Namibia and western North America.Paleoecological analysis of successive bedding planes of strata from the late Ediacaran Rawnsley Quartzite in the Flinders Ranges of South Australia, reveals that TOS represent the most common organic features in bedding-surface assemblages of the Ediacara biota. The TOS consist of preserved, patterned assemblages of textured organic mats, fibers and simple tubular body fossils. Complex Ediacara body fossils while striking for their distinctive body plans, and dominating some of the beds, are relatively minor components of combined overall surface area. Many elements of TOS have previously been miss-diagnosed as trace fossils, which are in practice limited to two or at most three morphotypes that indicate the presence of Bilateria. Although TOS represent a simpler grade of organismic construction than discrete and more complex Ediacara body fossils, they were preserved in a similar manner. Marked variability in all components of the biota between successive surfaces suggests that Ediacara ecologies fluctuated at short intervals despite an apparently consistent sedimentary regime. (C) 2009 Elsevier B.V. All rights reserved.