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DOI:	10.1371/journal.pone.0164071
论文题名:	Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway
作者:	Christopher L. Kirkland; Breandán A. MacGabhann; Brian L. Kirkland; J. Stephen Daly
刊名:	PLOS ONE
ISSN:	1932-6203
出版年:	2016
发表日期:	2016-10-26
卷:	11, 期:10
英文关键词:	Fossils ; Paleobiology ; Volcanoes ; Silurian period ; Cambrian period ; Stratigraphy ; Biostratigraphy ; Sediment
英文摘要:	The Hellefjord Schist, a volcaniclastic psammite-pelite formation in the Caledonides of Arctic Norway contains discoidal impressions and apparent tube casts that share morphological and taphonomic similarities to Neoproterozoic stem-holdfast forms. U-Pb zircon geochronology on the host metasediment indicates it was deposited between 437 ± 2 and 439 ± 3 Ma, but also indicates that an inferred basal conglomerate to this formation must be part of an older stratigraphic element, as it is cross-cut by a 546 ± 4 Ma pegmatite. These results confirm that the Hellefjord Schist is separated from underlying older Proterozoic rocks by a thrust. It has previously been argued that the Cambrian Substrate Revolution destroyed the ecological niches that the Neoproterozoic frond-holdfasts organisms occupied. However, the discovery of these fossils in Silurian rocks demonstrates that the environment and substrate must have been similar enough to Neoproterozoic settings that frond-holdfast bodyplans were still ecologically viable some hundred million years later.
URL:	http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0164071
Citation statistics:
资源类型:	期刊论文
标识符:	http://119.78.100.158/handle/2HF3EXSE/14474
Appears in Collections:	过去全球变化的重建影响、适应和脆弱性科学计划与规划气候变化与战略全球变化的国际研究计划气候减缓与适应气候变化事实与影响

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作者单位:

Department of Applied Geology, (Centre for Exploration Targeting – Curtin Node and Core to Crust Fluid Centre), Curtin University, Perth, Australia

Recommended Citation:

Christopher L. Kirkland,Breandán A. MacGabhann,Brian L. Kirkland,et al. Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway[J]. PLOS ONE,2016-01-01,11(10)

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