Ediacaran Microfossils from the Ura Formation, Baikal-Patom Uplift, Siberia: Taxonomy and Biostratigraphic Significance
Ediacaran Microfossils from the Ura Formation, Baikal-Patom Uplift, Siberia: Taxonomy and Biostratigraphic Significance
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DOI：
10.1666/11-022.1
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发表时间：
2011-09
期刊：
影响因子：
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通讯作者：
V. N. Sergeev;A. Knoll;N. G. Vorob’eva
中科院分区：
文献类型：
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作者：
V. N. Sergeev;A. Knoll;N. G. Vorob’eva
摘要西伯利亚中部乌拉组上部页岩中丰富多样的微体化石记录了西伯利亚地台东南缘沿着埃迪卡拉纪早中期的生活。乌拉组在勒拿河流域的一系列剖面中暴露良好，但最好的微体化石组合来自乌拉河沿着的一个地方。在这里，地层最上面的20米包含各种各样的微体化石，作为有机压缩物保存得非常好。化石包括近24种大型棘状微体化石的形态种，可归因于埃迪卡拉纪复合体（ECAP），这是一种独特的组合，只在其他地方从较低但不是最低的埃迪卡拉纪岩石中发现。ECAP的发现证实了化学地层学的推断，在地层中以前被认为是中元古代通过Cryogenian，极大地改变了沉积序列和元古代构造的地层解释西伯利亚平台。系统古生物学报告的36个分类群（5个非正式描述）分配到23个属的真核和原核微化石。提出1新属2新种：大锚囊壳Ancorosphaeridium magnum n.一般的;一般的sp.和A.次要的;次要的一般的;一般的sp.
Abstract Abundant and diverse microfossils from shales of the uppermost Ura Formation, central Siberia, document early to middle Ediacaran life along the southeastern margin of the Siberian Platform. The Ura Formation is well exposed in a series of sections in the Lena River basin but the best microfossil assemblages come from a locality along the Ura River. Here, the uppermost twenty meters of the formation contain diverse microfossils exceptionally well preserved as organic compressions. Fossils include nearly two dozen morphospecies of large acanthomorphic microfossils attributable to the Ediacaran Complex Acanthomorph Palynoflora (ECAP), a distinctive assemblage known elsewhere only from lower, but not lowermost, to middle Ediacaran rocks. Discovery of ECAP in strata previously considered Mesoproterozoic through Cryogenian confirms inferences from chemostratigraphy, dramatically changing stratigraphic interpretation of sedimentary successions and Proterozoic tectonics on the Siberian Platform. Systematic paleontology is reported for 36 taxa (five described informally) assigned to 23 genera of both eukaryotic and prokaryotic microfossils. One new genus and two new species are proposed: Ancorosphaeridium magnum n. gen. n. sp. and A. minor n. gen. n. sp.