DOI: 10.1016/j.palaeo.2015.07.021
论文题名: Miocene Clypeaster from Valencia (E Spain): Insights into the taphonomy and ichnology of bioeroded echinoids using X-ray micro-tomography
作者: Rahman I.A. ; Belaústegui Z. ; Zamora S. ; Nebelsick J.H. ; Domènech R. ; Martinell J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 438 起始页码: 168
结束页码: 179
语种: 英语
英文关键词: Clypeaster
; Ichnology
; Miocene
; Rocellaria
; Taphonomy
; X-ray micro-tomography
英文摘要: Taphonomic analysis and X-ray micro-tomography (μCT) were applied to Clypeaster specimens from the Miocene of Fuente del Jarro (Valencia, Spain). This enabled the identification of various preservational features, including encrustation, bioerosion, abrasion and post-depositional cracking. Approximately 15% of the studied specimens were affected by encrusters and/or borers. Of particular interest was a single intensely-bored specimen preserving numerous cross-cutting bioerosion structures. These structures exhibit a distinctive morphology consisting of clavate or flask-shaped chambers with a circular to oval cross-section, a narrow neck region near the figure-of-eight-shaped aperture and a chimney extending outside the Clypeaster test. The excellent preservation and characteristic morphology, as revealed by the μCT scan, coupled with the observation that (in some cases) articulated bivalve shells are still present within the chambers, allows for the identification of the tracemaker as the boring bivalve Rocellaria, reaffirming these tube-dwelling animals as borers, burrowers and crypt-builders.The trace fossils described herein are semi-endoskeletal dwellings, representing a combination of bioerosion through the plates of the echinoids, bioturbation in the form of burrowing into the sediment infill of the Clypeaster specimen and carbonate secretion resulting in a crypt. The morphologies of the different dwellings are influenced by the limited available space within the echinoid tests. This study confirms the importance of the relatively stable and thick Clypeaster shells as benthic islands in Cenozoic sandy littoral settings. The high degree of multiple colonizations, as well as the uniform orientation of the burrows, suggests a long-term stable position of this secondary substrate at or near the sediment surface. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68798
Appears in Collections: 过去全球变化的重建
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作者单位: School of Earth Sciences, University of Bristol, Life Sciences Building, 24 Tyndall Avenue, Bristol, United Kingdom; Departament d'Estratigrafia, Paleontologia i Geociències Marines, Universitat de Barcelona (UB), Martí i Franquès s/n, Barcelona, Spain; IRBio (Biodiversity Research Institute), Universitat de Barcelona (UB), Av. Diagonal 643, Barcelona, Spain; Instituto Geológico y Minero de España, Manuel Lasala, 44, 9B, Zaragoza, Spain; Department of Geosciences, Hölderlinstrasse 12, Tübingen, Germany
Recommended Citation:
Rahman I.A.,Belaústegui Z.,Zamora S.,et al. Miocene Clypeaster from Valencia (E Spain): Insights into the taphonomy and ichnology of bioeroded echinoids using X-ray micro-tomography[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,438