The ammonites of the Middle Jurassic Cranocephalites beds of East Greenland

Q2 Earth and Planetary Sciences Geological Survey of Denmark and Greenland Bulletin Pub Date : 2015-12-28 DOI:10.34194/geusb.v34.4488
J. Callomon, P. Alsen, F. Surlyk
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引用次数: 19

Abstract

Thick successions of marine Middle Jurassic deposits rich in ammonites occur in the Jameson Land Basin in central East Greenland. The fauna of the so-called Cranocephalites beds of this basin, comprising the Borealis–Pompeckji Standard Zones, was until now largely represented by a single collection. This was made by T.M. Harris during a 1927 excursion up the valley of Ugleelv to Katedralen, the type area of Cranocephalites pompeckji, which is the oldest named species of this genus. Revisits to this area in 1994 and 1996 by JHC resulted in a large bed-by-bed collection of Cranocephalites. The number of faunal horizons that could be distinguished grew from the nine previously recognised to thirty-four today. The zonal stratigraphy of the Cranocephalites beds encompasses the Borealis, Indistinctus and Pompeckji Standard Zones. The Pompeckji Zone is subdivided into four new subzones, reflecting four successive basic morphologies of Cranocephalites that should be recognisable more widely and are thus useful for subzonal correlations. The detailed zonation that serves as the secondary standard zonation for the Boreal Province in the Middle Jurassic is thus highly improved. The biostratigraphic resolution obtained here is near the achievable limits. It allows a high-resolution study of the evolution of the ammonites which on this timescale appears to be continuous. Three new species are described: Cranocephalites carolae sp. nov., Cranocephalites intermissus sp. nov. and Cranocephalites episcopalis sp. nov. An additional new species, Cranocephalites tvaerdalensis sp. nov., is described in the appendix by P. Alsen based on collections from Tvaerdal on Geographical Society O, North-East Greenland. This species is also recorded in Jameson Land.
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格陵兰东部中侏罗世头头岩床中的菊石
在格陵兰岛东部中部的詹姆逊陆盆中,发育了富含菊石的厚层海相中侏罗统沉积。这个盆地的所谓Cranocephalites地层的动物群,包括北海-庞佩基标准带,到目前为止,主要是一个单一的集合。这是T.M.哈里斯在1927年沿着Ugleelv山谷到Katedralen旅行时拍下的,Katedralen是pompeckji Cranocephalites的模式区,这是这个属中最古老的命名物种。1994年和1996年,JHC对该地区进行了重访,收集了大量的颅头岩。可以区分的动物层数从以前的9个增加到今天的34个。颅头岩层的地层学分为Borealis、inctus和Pompeckji标准带。Pompeckji带被细分为四个新的亚带,反映了四种连续的颅头岩基本形态,这些形态应该被更广泛地识别,因此对亚带对比有用。作为北省中侏罗统二级标准分区的详细分区得到了极大的改进。这里获得的生物地层分辨率接近可达到的极限。它可以对菊石的进化进行高分辨率的研究,在这个时间尺度上,菊石似乎是连续的。本文描述了3个新种:Cranocephalites carolae sp. nov.、Cranocephalites intermissus sp. nov.和Cranocephalites episcopalis sp. nov.。P. Alsen在附录中根据格陵兰东北部地理学会O的Tvaerdal资料描述了另一个新种Cranocephalites tvaerdalensis sp. nov.。该物种在詹姆逊地也有记录。
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来源期刊
CiteScore
2.30
自引率
0.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: GEUS Bulletin publishes geoscience research papers, monographs and map descriptions with a focus on Denmark, Greenland and the wider North Atlantic and Arctic region. We welcome submissions that fit this remit. Specifically, we publish: 1.Short articles intended as rapid communications that are of immediate interest to the international geoscience community (these include new research, datasets, methods or reviews) 2.Regular-length articles that document new research or a review of a topic of interest 3.Monographs (single volume works, by arrangement with the editorial office) 4.Maps and descriptive texts (produced by GEUS for Greenland and Denmark, by arrangement with the editorial office) GEUS Bulletin serves a broad geoscientific readership from research, industry, government agencies, NGOs and special interest groups.
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