Early Middle Devonian trilobites and events in the Nismes – Vireux-Molhain area, southern border of the Dinant Synclinorium (Belgium, northern France)

IF 1.2 4区地球科学 Q2 GEOLOGY

Geologica Belgica Pub Date : 2019-02-26 DOI:10.20341/GB.2019.001

Allart P. VAN VIERSEN, Peter Taghon, Benedikt Magrean

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引用次数: 2

Abstract

Well-preserved trilobite specimens are recorded from Eifelian strata between the villages of Nismes (southern Belgium) and Vireux-Molhain (northern France). In the area of study the lower Eifelian Vieux Moulin Member of the Jemelle Formation crops out. The diversified trilobite associations of this unit occur in dark shales and siltstones during a deepening phase and replace the comparatively poorly diversified trilobite fauna of the underlying Eau Noire Formation. This overturn of the local trilobite fauna might, in part, be considered a regional expression of the globally recognised Choteč Event. A marked influx of exotic trilobites in the Vieux Moulin Member is provisionally referred to the local Vieux Moulin Event. Trilobite diversity peaked in the middle Eifelian part (Chavées Member) of the Jemelle Formation before drastically dropping in the upper part of this formation. The manifestations in the Ardennes of the eastern North American Bakoven and Stony Hollow Events can neither be confirmed nor rejected based on the currently available data. New taxa from the early Eifelian part of the Jemelle Formation in the area of study are Asteropyge boeckae sp. nov., Asteropyge eonia sp. nov., Asteropyge filoxenia sp. nov., Cyphaspis insolata sp. nov., Cyphaspis iuxta sp. nov., Diademaproetus pertinax sp. nov., Geesops icovellaunae sp. nov., Gerastos kesselaeri sp. nov., Kettneraspis eftychia sp. nov., Pedinopariops ceuthonymus sp. nov., Pedinopariops richterianus geminus ssp. nov., Scabriscutellum archinalae sp. nov., Septimopeltis akatastasia sp. nov. and Tropidocoryphe insciens sp. nov. Our material includes exceptionally rare, well-preserved specimens from the famous “Mur des douaniers” locality near Vireux-Molhain. Additionally, Astycoryphe rugocauda sp. nov. is described from the lower Eifelian Couvin Formation (southern Belgium) and Gerastos silvicultrix sp. nov. from the uppermost Emsian Heisdorf Formation (German Eifel).

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中泥盆世早期尼姆斯-维勒克斯-莫尔海因地区的三叶虫及其事件，迪南向斜区南部边界(比利时，法国北部)

保存完好的三叶虫标本是在比利时南部的Nismes村和法国北部的Vireux-Molhain村之间的Eifelian地层中发现的。在研究区域，耶梅尔组的下艾菲利统Vieux Moulin段出露。该单元多样化的三叶虫组合出现在深埋阶段的深色页岩和粉砂岩中，取代了下伏Eau Noire组相对缺乏多样性的三叶虫动物群。这种对当地三叶虫动物群的颠覆，可能在一定程度上被认为是全球公认的乔特涅事件的区域表现。外来三叶虫在老磨坊成员的显著涌入暂时被称为当地的老磨坊事件。三叶虫的多样性在Jemelle组的中部Eifelian部分(chav成员)达到顶峰，然后在该组的上部急剧下降。根据现有资料，在阿登地区北美东部的Bakoven和Stony Hollow事件的表现既不能证实也不能否定。研究区耶梅勒组早期的新分类群有:11号星斑蝶(Asteropyge boeckae sp. nov)、11号星斑蝶(Asteropyge eonia sp. nov)、11号星斑蝶(Asteropyge filoxenia sp. nov)、11号星斑蝶(Diademaproetus pertinax sp. nov)、11号星斑蝶(Geesops icovellaunae sp. nov)、11号星斑蝶(Gerastos kesselaeri sp. nov)、11号星斑蝶(Kettneraspis eftychia sp. nov)、11号星斑蝶(Pedinopariops ceuthonymus sp. nov)、11号星斑蝶(Pedinopariops richterianus geminus sp. nov)。我们的材料包括来自Vireux-Molhain附近著名的“Mur des douaniers”地区的非常罕见的、保存完好的标本。此外，来自比利时南部Eifelian Couvin组的Astycoryphe rugocauda sp. 11 .和来自德国Eifel的Emsian Heisdorf组的Gerastos silvicultrix sp. 11 .。

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来源期刊

Geologica Belgica 地学-地质学

CiteScore

4.70

自引率

27.80%

发文量

审稿时长

>12 weeks

期刊介绍： Geologica Belgica is a Belgian journal that welcomes papers concerning all aspects of the earth sciences, with a particular emphasis on the regional geology of Belgium, North West Europe and central Africa. Papers not dedicated to the geology of Belgium, North West Europe and central Africa are only accepted when one of the authors is linked to a Belgian University or Institution. Thematic issues are highly appreciated. In this case, guest editors take in charge the selection of the manuscripts and the subject of the papers can be enlarged. The journal is in open access. Submitted manuscripts should be concise, presenting material not previously published. The journal also encourages the publication of papers from Belgian junior authors. Short letters are accepted. Papers written in English are preferred. Each mansucript will be reviewed by at least two reviewers.