DOI: 10.1016/j.palaeo.2015.02.006
论文题名: Dickinsonia liftoff: Evidence of current derived morphologies
作者: Evans S.D. ; Droser M.L. ; Gehling J.G.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 434 起始页码: 28
结束页码: 33
语种: 英语
英文关键词: Dickinsonia
; Ediacara biota
; Ediacaran period
; South Australia
; Taphonomy
英文摘要: Dickinsonia, an iconic member of the Ediacara biota, is abundant in the Ediacaran deposits found at the Nilpena field site, South Australia. Despite exquisite fossil preservation at this site, many specimens of Dickinsonia appear to be incomplete, with an apparently "missing piece" on the periphery. Orientation measurements from specimens on three fossil beds suggest that these so-called "missing pieces" are aligned irrespective of the axial orientation of Dickinsonia. The nonrandom orientation of incomplete specimens matches that of other aligned structures found on two of these beds. The preferred directionality of this feature suggests the molding of incomplete specimens under the influence of current activity prior to or during burial. We propose that this feature originates where part of a Dickinsonia was lifted off of the substrate during a storm event and that sand was deposited beneath this lifted portion. This model suggests that Dickinsonia was easily separated from the sea floor and was not attached to the substrate on which it lived. This is consistent with the data from Dickinsonia footprints suggesting that Dickinsonia was mobile. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68875
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Sciences, University of California at Riverside, 900 University Ave, Riverside, CA, United States; South Australian Museum, University of Adelaide, North Terrace, Adelaide, SA, Australia
Recommended Citation:
Evans S.D.,Droser M.L.,Gehling J.G.. Dickinsonia liftoff: Evidence of current derived morphologies[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,434