A redescription of the endemic antiarch placoderm Asterolepis thule from the Middle Devonian (Givetian) of Shetland and its biostratigraphical horizon

IF 0.5 4区地球科学 Q4 GEOLOGY

Scottish Journal of Geology Pub Date : 2018-05-15 DOI:10.1144/sjg2018-005

M. Newman, J. D. Den Blaauwen

引用次数: 4

Abstract

The Givetian (Middle Devonian) antiarch Asterolepis thule was first described in 1932 and its stratigraphical horizon was poorly understood as were all the Devonian deposits in the SE of Shetland (South East Shetland Group). Since that time a greater understanding of the age of these deposits has been made. This, coupled with the greater clarity of the biostratigraphy of the Devonian of Scotland and its correlation with the Baltic Devonian, has allowed the species to be placed in a biostratigraphical zonation. The species is confined to Sumburgh Head and so appears endemic. Other species are also endemic and there are some relict fauna in the South East Shetland Group. This suggests that the South East Shetland Group fauna originated mostly in isolation to the main depositional areas of the Givetian in Scotland and elsewhere, although some species are more cosmopolitan.

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设得兰群岛中泥盆世(吉文世)特有的反弓板皮动物Asterolepis thule的重新描述及其生物地层

Givetian（中泥盆纪）antiarch Asterolepis thule于1932年首次被描述，其地层层位与设得兰东南部（东南设得兰群）的所有泥盆纪矿床一样，人们知之甚少。从那时起，人们对这些矿床的年龄有了更深入的了解。这一点，加上苏格兰泥盆纪的生物地层学及其与波罗的海-泥盆纪之间的相关性更加清晰，使该物种能够被置于生物地层学分带中。该物种仅限于萨姆堡黑德，因此似乎是特有种。其他物种也是地方性的，东南设得兰群岛也有一些残余动物群。这表明，东南设得兰群动物群主要起源于苏格兰和其他地方的吉维阶主要沉积区，尽管有些物种更具世界性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Scottish Journal of Geology 地学-地质学

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Although published only since 1965, the Scottish Journal of Geology has a long pedigree. It is the joint publication of the Geological Society of Glasgow and the Edinburgh Geological Society, which prior to 1965 published separate Transactions: from 1860 in the case of Glasgow and 1863 for Edinburgh. Traditionally, the Journal has acted as the focus for papers on all aspects of Scottish geology and its contiguous areas, including the surrounding seas. The publication policy has always been outward looking, with the Editors encouraging review papers and papers on broader aspects of the Earth sciences that cannot be discussed solely in terms of Scottish geology. The diverse geology of Scotland continues to provide an important natural laboratory for the study of earth sciences; many seminal studies in geology have been carried out on Scottish rocks, and over the years the results of much of this work had been published in the Journal and its predecessors. The Journal fully deserves its high reputation worldwide and intends to maintain its status in the front rank of publications in the Earth sciences.