DOI: 10.1016/j.palaeo.2015.02.009
论文题名: A new age constraint for the Early Triassic Alcova Limestone (Chugwater Group), Wyoming
作者: Lovelace D.M. ; Doebbert A.C.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 424 起始页码: 1
结束页码: 5
语种: 英语
英文关键词: Alcova limestone
; Corosaurus alcovensis
; Early triassic
; Pistosaurid
; Strontium
英文摘要: The Alcova Limestone is a widely exposed but poorly studied Triassic unit found throughout Wyoming. Although it is used as a regional lithostratigraphic marker bed, the age of the limestone is not well constrained and contention regarding its depositional nature (marine vs. non-marine saline lake) has not been adequately resolved, although the marine hypothesis is more widely accepted. Currently, its age is based on the occurrence of a single basal pistosaurid, Corosaurus alcovensis.We provide the first 87Sr/86Sr analysis of the Alcova Limestone. The data strongly support a marine origin for this unit. Furthermore, the data provide an age range, based on their placement on the marine strontium curve, that limits the deposition of the Alcova Limestone to the latest Olenekian to earliest Anisian (Early Triassic-Middle Triassic boundary). This placement is consistent with the timing of the Spathian regression recorded in other transitional marine to non-marine strata of the western USA. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68997
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geoscience, University of Wisconsin-Madison, 1215 W. Dayton St., Madison, WI, United States
Recommended Citation:
Lovelace D.M.,Doebbert A.C.. A new age constraint for the Early Triassic Alcova Limestone (Chugwater Group), Wyoming[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,424