DOI: 10.1016/j.palaeo.2014.12.013
论文题名: Palaeoenvironments of the Eifelian dolomites with earliest tetrapod trackways (Holy Cross Mountains, Poland)
作者: Narkiewicz M. ; Grabowski J. ; Narkiewicz K. ; Niedźwiedzki G. ; Retallack G.J. ; Szrek P. ; De Vleeschouwer D.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 420 起始页码: 173
结束页码: 192
语种: 英语
英文关键词: Lagoonal environment
; Microbial dolomite
; Middle Devonian
; Palaeoecology
; Quadrupedality development
; Tetrapods
英文摘要: The Eifelian dolomites in the Zachełmie Quarry (Holy Cross Mountains, Poland) contain trackways and tracks of tetrapods 390-391. Ma old, and thus the oldest known so far. The environments of the trackway-bearing beds have been investigated using sedimentological, palaeontological, geochemical and palaeomagnetic methods. The reconstructed tetrapod habitats comprised shallow-water lagoons separated from an open marine basin by sparsely vegetated islands and spits. The lagoonal waters were well-aerated and a few metres deep at most, undergoing periodic desiccation. The dolomitic sediments, primarily of microbial origin, formed in tropical waters of slightly modified marine composition. Oxygen isotope data obtained from the dolomicrites suggest water temperatures around 30. °C. The seasonal semi-arid to sub-humid climate, deduced from paleosol characteristics, was probably of a tropical monsoonal type. The degree of restriction of the lagoonal system evolved from relatively open, evaporation-dominated towards increasingly closed, freshwater influenced.The detailed observations of the footprint-bearing beds, as well as the characteristics of the tracks, indicate that they were formed mostly under subaqueous conditions, by wading, walking on the bottom or swimming animals. Lack of tidal indicators in the restricted Zachełmie lagoons argues against previous concept that tidal flats served as a food source for the early tetrapods. Nor is a hypothesis of flooded woodlands confirmed as a habitat promoting the "fish-to-tetrapod" transition. We propose that functional limbs emerged among aqueous animals that acquired their locomotional capabilities in a shallow lagoonal water before attempting longer excursions on land. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69042
Appears in Collections: 过去全球变化的重建
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作者单位: Polish Geological Institute-NRI, Warszawa, Poland; Department of Organismal Biology, Uppsala University, Uppsala, Sweden; Department of Geological Sciences, University of Oregon, EugeneOR, United States; Earth System Sciences, Vrije Universiteit Brussel, Brussels, Belgium
Recommended Citation:
Narkiewicz M.,Grabowski J.,Narkiewicz K.,et al. Palaeoenvironments of the Eifelian dolomites with earliest tetrapod trackways (Holy Cross Mountains, Poland)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,420