globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.07.038
论文题名:
Disentangling the history of complex multi-phased shell beds based on the analysis of 3D point cloud data
作者: Harzhauser M.; Djuricic A.; Mandic O.; Zuschin M.; Dorninger P.; Nothegger C.; Székely B.; Puttonen E.; Molnár G.; Pfeifer N.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 437
起始页码: 165
结束页码: 180
语种: 英语
英文关键词: Miocene ; Oyster biostrome ; Taphonomy ; Terrestrial laser scanning ; Tsunami
英文摘要: We present the largest GIS-based data set of a single shell bed, comprising more than 10,280 manually outlined objects. The data are derived from a digital surface model based on high-resolution terrestrial laser scanning (TLS) and orthophotos obtained by photogrammetric survey, with a sampling distance of 1. mm and 0.5. mm, respectively. The shell bed is an event deposit, formed by a tsunami or an exceptional storm in an Early Miocene estuary. Disarticulated shells of the giant oyster Crassostrea gryphoides are the most frequent objects along with venerid, mytilid and solenid bivalves and potamidid gastropods. The contradicting ecological requirements and different grades of preservation of the various taxa mixed in the shell bed, along with a statistical analysis of the correlations of occurrences of the species, reveal an amalgamation of at least two pre- and two post-event phases of settlement under different environmental conditions. Certain areas of the shell bed display seemingly significant but opposing shell orientations. These patterns in coquinas formed by densely spaced elongate shells may result from local alignment of neighboring valves due to occasional events and bioturbation during the years of exposure. Similarly, the patchy occurrence of high ratios of shells in stable convex-up positions may simply be a result of such "maturity" effects. Finally, we document the difficulties in detecting potential tsunami signatures in shallow marine settings even in exceptionally preserved shell beds due to taphonomic bias by post-event processes. © 2015.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68833
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作者单位: Geological Paleontological Department, Natural History Museum Vienna, Vienna, Austria; Department of Geodesy and Geoinformation, Research Group for Photogrammetry, Vienna University of Technology, Vienna, Austria; Department of Palaeontology, University of Vienna, Vienna, Austria; 4D-IT GmbH, Vienna, Austria; Department of Geophysics and Space Science, Eötvös University, Budapest, Hungary; Finnish Geospatial Research Institute in the National Land Survey of Finland, Department of Remote Sensing and Photogrammetry and Centre of Excellence in Laser Scanning Research, Geodeetinrinne 2, Masala, Finland; MTA-ELTE Geological, Geophysical and Space Science Research Group, Hungarian Academy of Sciences at Eötvös University, Budapest, Hungary

Recommended Citation:
Harzhauser M.,Djuricic A.,Mandic O.,et al. Disentangling the history of complex multi-phased shell beds based on the analysis of 3D point cloud data[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,437
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