气候变化领域集成服务门户(CCPortal): Big bedding planes: Outcrop size and spatial heterogeneity influence trace fossil analyses

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DOI	10.1016/j.palaeo.2018.08.008
	Big bedding planes: Outcrop size and spatial heterogeneity influence trace fossil analyses
	Marenco K.N.; Hagadorn J.W.
发表日期	2019
ISSN	0031-0182
起始页码	14
结束页码	24
卷号	513
英文摘要	Roadcuts, core, cliffs and even mountainside exposures often limit the lateral extent to which we can assess bioturbation on bedding planes, simply because exposures of such surfaces are generally rare or small. Such constraints may hamper paleoenvironmental and paleoecological interpretations drawn from facies where most bioturbation is bed-parallel or patchily distributed. To explore how acute such constraints are, we conducted a pilot study of bioturbation in three exceptionally large (>5 m2), well-exposed, paleoenvironmentally similar bedding planes from the Cambrian of Wisconsin. The goal was to test the hypothesis that trace fossils and biogenic sediment disruption can be distributed heterogeneously at the scale of meters to decameters. Mapping the size variation and distribution of trace fossils across these bedding planes reveals variable patchiness. Individual bioturbated patches tend to be large (m-scale), but the density of biogenic sediment disruption within these patches is quite heterogeneous. In addition, bioturbated areas are separated by zones of undisturbed sediment that vary in size from <0.5 m2 to >3 m2. These observations suggest that ancient bedding planes, like modern substrate surfaces, can exhibit considerable lateral bioturbation heterogeneity at a range of spatial scales. Caution is thus urged when extrapolating the distribution and diversity of trace fossils and other biogenic sedimentary structures across broad sedimentary horizons based on small (≤1 m2) bedding plane exposures. © 2018 Elsevier B.V.
英文关键词	Bioturbation; Cambrian; Ichnofabric; Patchiness; Sandstone; Wisconsin
语种	英语
scopus关键词	bedding plane; biogenic deposit; bioturbation; Cambrian; facies; heterogeneity; ichnofabric; outcrop; paleoecology; paleoenvironment; patchiness; sandstone; sedimentary structure; trace fossil; Wisconsinan
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151202
作者单位	Department of Geology, Bryn Mawr College, 101 North Merion Avenue, Bryn Mawr, PA 19010, United States; Department of Earth Sciences, Denver Museum of Nature & Science, 2001 Colorado Boulevard, Denver, CO 80205, United States
推荐引用方式 GB/T 7714	Marenco K.N.,Hagadorn J.W.. Big bedding planes: Outcrop size and spatial heterogeneity influence trace fossil analyses[J],2019,513.
APA	Marenco K.N.,&Hagadorn J.W..(2019).Big bedding planes: Outcrop size and spatial heterogeneity influence trace fossil analyses.Palaeogeography, Palaeoclimatology, Palaeoecology,513.
MLA	Marenco K.N.,et al."Big bedding planes: Outcrop size and spatial heterogeneity influence trace fossil analyses".Palaeogeography, Palaeoclimatology, Palaeoecology 513(2019).