{"refrec":{"BRefID":233885,"RR":"<b>Casier, J.-G.; Préat, A.</b> (2006). Ostracods and lithofacies close to the Eifelian-Givetian boundary (Devonian) at Aisemont (Namur Synclinorium, Belgium). <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 76</i>: 5-29","BEntID":225570,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":null,"RefStringPartII":". <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 76</i>: 5-29","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Casier, J.-G.; Préat, A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Casier, J.-G.; Préat, A.","Englishabstract":"The paper presents the sedimentological analysis and the ostracod study of the upper part of the Rivière Fm. and of the stratotype of the Névremont Fm. in the Aisemont section, the reference section for the Eifelian-Givetian boundary (Devonian) in the southern border of the Namur Synclinorium, Belgium.Thirteen major microfacies types are defined. Their stratigraphic succession records the transition from a mixed siliciclastic-carbonate ramp (upper Eifelian) to a carbonate platform (lower Givetian). About 6,350 ostracods were extracted. Forty species (19 in open nomenclature) are recognized in the Rivière Fm. and 48 species (27 in open nomenclature) in the Névremont Fm. They belong exclusively to the Eifelian Mega-Assemblage and their distribution is controlled mainly by water energy and salinity variations.The sedimentological analysis and the study of ostracods are in good agreement with recent conodont study of GOUWY & BULTYNCK (2003). Our work confirms the position of the Rivière and Névremont formations boundary and highlights a gap of the major part of the Hanonet and Trois-Fontaines formations of the southern Dinant Synclinorium. This hiatus is probably associated with the lowstand systems tract at the Eifelian-Givetian boundary interval in northern France and southern Belgium (PRÉAT, 2004).The presence of <i>Quassilites fromelennensis</i> and <i>Jenningsina heddebauti</i>, indicates that a great part of the transitional zone of GOUWY & BULTYNCK (2003) is of Givetian age.","AbstractOtherLang":"Nous présentons ici l'analyse sédimentologique et l'étude des ostracodes de la partie supérieure de la Formation de Rivière et du stratotype de la Formation de Névremont dans la coupe d'Aisemont. Cette coupe sert aussi de référence pour la limite Eifelien/Givétien au bord sud du Synclinorium de Namur.L'analyse sédimentologique des formations de Rivière et de Névremont permet de reconnaître une séquence standard de 13 microfaciès montrant le passage de milieux marins ouverts peu profonds aux milieux hypersalins proches de l'émersion.Environ 6.350 carapaces, valves et fragments d'ostracodes ont été extraits de la coupe d'Aisemont. Quarante espèces (19 en nomenclature ouverte) sont reconnues dans la Formation de Rivière, et 48 (27 en nomenclature ouverte) dans la Formation de Névremont. Elles appartiennent exclusivement au Méga-Assemblage de l'Eifel et leur distribution est contrôlée principalement par l'agitation des eaux et par de fortes variations de salinité.L'analyse sédimentologique et l'étude des ostracodes justifient la position de la limite des formations de Rivière et de Névremont et confirment les corrélations avec le bord sud du Synclinorium de Dinant établies à l'aide des conodontes par GOUWY & BULTYNCK (2003). La majeure partie des formations d'Hanonet et de Trois-Fontaines du bord sud du Synclinorium de Dinant est absente au niveau de la transition Eifélien-Givétien au bord sud du Synclinorium de Namur (Aisemont). Cet hiatus est probablement lié à la présence d'un cortège de bas niveau marin à la transition Eifélien-Givétien au Nord de la France et au Sud de la Belgique (PRÉAT, 2004).La présence de <i>Quassilites fromelennensis</i> et de <i>Jenningsina heddebauti</i>, indique qu'une grande partie de la zone de transition de GOUWY & BULTYNCK (2003) est d'âge givétien.","BibLvlCode":"AS","StandardTitle":"Ostracods and lithofacies close to the Eifelian-Givetian boundary (Devonian) at Aisemont (Namur Synclinorium, Belgium)","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Ostracods, Microfacies, Eifelian, Givetian, Namur Synclinorium, Belgium","OtherDescriptors":null,"Notes":null,"AnaPub":2006,"MonPub":null,"DateUpdate":"2014-02-27","DateCreate":"2014-02-26","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":233885,"PubliDate":2006,"Pagination":"5-29","XtraPublOfAnaID":null,"ISBN":null,"Volume":"76","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":64308,"SerRR":"Bulletin van het Koninklijk Belgisch Instituut voor Natuurwetenschappen. 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