DOI: 10.1016/j.palaeo.2016.08.033
论文题名: Ichnology and depositional environment of the Middle Devonian Valentia Island tetrapod trackways, south-west Ireland
作者: Stössel I. ; Williams E.A. ; Higgs K.T.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 462 起始页码: 16
结束页码: 40
语种: 英语
英文关键词: fluvial sedimentology
; Givetian
; Munster Basin
; Old Red Sandstone
; tetrapod
; trackway
; Valentia Island
英文摘要: Nine tetrapod trackways are described from the Middle Devonian continental Valentia Slate Formation on the north-eastern coast of Valentia Island in County Kerry, Ireland. The trackways occur at three sites – Dohilla, Coosadillisk and Culoo Head – the latter two being recorded for the first time. Morphological and taphonomic analyses of the trackways suggest they were made by populations of similar tetrapods, but of varying size (body length = 0.5 to 1 m; width = 0.15 to 0.30 m), that moved in some cases by terrestrial locomotion and in others possibly by a slow “paddling gait” while the substrate was submerged by very shallow floodwater. Sedimentological facies analysis of the trackway-bearing sequences has been carried out for the first time and shows that the preserved trackways are associated with the late stages of (1) a principal river channel margin (Coosadillisk), (2) a minor floodplain drainage channel (Culoo Head) and (3) a sand-rich crevasse splay/medial alluvial-ridge environment (Dohilla). The Valentia Island tetrapods inhabited marginal environments of proximal river channels < 20 km from the northern margin of the Munster Basin, where hinterland drainage basins probably provided reliable sources of water in an overall semi-arid climate. It is proposed that the more perennial river channel belts crossing the basin would have provided conducive route ways that allowed ancestral tetrapods to migrate (> 170 km) northwards into the continent from postulated shallow marine habitats as they evolved this capability over a potential 4–5 million year period during the Middle Devonian. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68206
Appears in Collections: 过去全球变化的重建
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作者单位: Interkantonales Labor, Schaffhausen, Switzerland; Schwarzadlerstrasse 21, Schaffhausen, Switzerland; Publication Office, Geostandards and Geoanalytical Research, CRPG-CNRS, 15 rue Notre Dame des Pauvres, Vandoeuvre-lès-Nancy, France; School of Biological, Earth and Environmental Sciences, University College, Cork, Ireland
Recommended Citation:
Stössel I.,Williams E.A.,Higgs K.T.. Ichnology and depositional environment of the Middle Devonian Valentia Island tetrapod trackways, south-west Ireland[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,462