Redescription of tetrapod trackways from the Mississippian Mabou Group, Lepreau Falls, New Brunswick, Canada

IF 1.2 4区 地球科学 Q2 GEOLOGY
M. Stimson, Randall F. Miller, S. Lucas, A. Park, S. Hinds
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引用次数: 5

Abstract

Red-bed strata exposed at Lepreau Falls, southern New Brunswick, were originally interpreted as belonging to the Triassic Lepreau Formation. Poorly preserved tetrapod trackways within the strata were previously assigned to two ichnospecies; one to a new Triassic ichnospecies, Isocampe lepreauense Sarjeant and Stringer, and the other to Rhynchosauroides cf. R. franconicus (Heller). Both were attributed to reptiles. Subsequent mapping of the rocks and reassignment of the exposed strata at Lepreau Falls to the Mississippian Mabou Group prompted our re-examination of the trackway fossils. Isocampe lepreauense was described from a specimen block preserving three trackways and the original description was based on erroneous interpretation of extramorphological digit drags. Rhynchosauroides cf. R. franconicus was a tentative assignment in a letter accompanying a cast in the New Brunswick Museum, but was never formally published. We redescribe and re-interpret all the trackways as gait variations produced by temnospondyls, and most closely resemble the Carboniferous ichnotaxon Matthewichnus .
加拿大新不伦瑞克省Lepreau Falls,密西西比Mabou群四足动物足迹的重新描述
在新不伦瑞克省南部Lepreau瀑布暴露的红层地层最初被解释为属于三叠纪Lepreau组。地层中保存较差的四足动物足迹以前被划分为两个鱼科;一个属于一个新的三叠纪鱼种,Isocampe lepreauense Sarjeant和Stringer,另一个属于Rhynchosauroides cf. R. franconicus (Heller)。两者都被认为是爬行动物。随后对Lepreau瀑布的岩石进行了测绘,并将暴露的地层重新划分为密西西比马布群,这促使我们重新研究了足迹化石。对lepreauense等坎贝的描述是基于一个保存了三条径迹的标本块,而最初的描述是基于对外变质数字拖的错误解释。Rhynchosauroides cf. R. franconicus是在新布伦瑞克博物馆的一封随附的信中暂定的名称,但从未正式发表。我们将所有的足迹重新描述和解释为由temnospondyls产生的步态变化,并且最接近石石纪的鱼分类单元Matthewichnus。
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来源期刊
Atlantic Geology
Atlantic Geology GEOLOGY-
CiteScore
2.10
自引率
18.80%
发文量
0
审稿时长
>12 weeks
期刊介绍: Atlantic Geology (originally Maritime Sediments, subsequently Maritime Sediments and Atlantic Geology) covers all aspects of the geology of the North Atlantic region. It publishes papers, notes, and discussions on original research and review papers, where appropriate to the regional geology.
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