{"refrec":{"BRefID":220026,"RR":"<b>Casier, J.-G.; Préat, A.</b> (1991). Evolution sédimentaire et Ostracodes de la base du Givetien à Resteigne (bord sud du Bassin de Dinant, Belgique). <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 61</i>: 157-177","BEntID":211759,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":null,"RefStringPartII":". <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 61</i>: 157-177","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 facies patterns of lower Givetian rocks (Trois-Fontaines, Terres d'Haurs and Mont d'Haurs Formations) at Resteigne quarry (southern border of Dinant Basin, Belgium) reveal a transition from mixed siliciclastic carbonate ramp to gently sloping carbonate platform without any true reefal barrier. Depositional conditions on the ramp were open marine, well circulated, well lit and very near or within wave base. The ramp evolved through a very shallow-subtidal to supratidal, restricted to semi-restricted, quiet stable platform during early Givetian times. A sedimentological model for this succession enables recognition of 12 major microfacies, ranging from open marine, below wave action zone, to reefal complexes, lagoons and supratidal mats. These microfacies define three principal facies belts. Four ecozones belonging to the \"Eifeler ökotyp\" are recognized in the Givetian of Resteigne quarry. Ecozone 0 is characterized by Leperditicopida in the middle and upper parts of the Trois-Fontaines Formation and indicates a restricted lagoonal environment; three ostracod sub-assemblages can be recorded in term of salinity. Ecozone I is characterized by a few species of Platycopina, Palaeocopina or Eridostraca, each present in large numbers; it indicates an open lagoonal environment in the Terre d'Haurs Formation and, exceptionally, in the middle and upper parts of the Trois-Fontaines Formation. Ecozone II, dominated by large, thick shelled Podocopina, indicates water turbulence at the base of the Trois-Fontaines Formation and in the Mont d'Haurs Formation. Ecozone III is rich in species of Podocopina, Platycopina, Metacopina, Palaeocopina and Eridostraca; it indicates a shallow open marine environment in the Mont d'Haurs Formation and, exceptionally, in the Terres d'Haurs Formation. Water movement and salinity are the principal ecological factors controlling the composition of the basal Givetian ostracod fauna at Resteigne. Their detailed analysis gives more information about the elementary regressive rhythms that produce cyclic patterns on the platform. A new species is erected: <i>Evlanella lessensis</i> n. sp.","AbstractOtherLang":"L'analyse sédimentologique du Givetien inférieur (Formations de Trois-Fontaines, des Terres d'Haurs et du Mont d'Haurs) à Resteigne (bord sud du Bassin de Dinant, Belgique) met en évidence le passage d'un système de rampe mixte siliciclastique et carbonatée à une plateforme sans pente véritable, ni barrière, récifale ou d'autre nature, bien développée. Douze microfaciès carbonates majeurs délimitant trois principales ceintures de faciès caractérisent la plate-forme carbonatée. L'évolution sédimentologique montre le passage d'un domaine marin ouvert peu structuré aux domaines lagunaires, d'abord restreints et bien structurés et ensuite lagunaires ouverts. Quatre écozones à Ostracodes appartenant à l'\"Eifeler ökotyp\" sont reconnues; elles soulignent les principaux changements de milieux observés. L'écozone 0 à Leperditicopida (parties moyenne et supérieure de la Formation de Trois-Fontaines) caractérise des milieux lagunaires restreints et trois sous-assemblages peuvent être distingués en fonction des variations de salinité. L'écozone I, caractérisée par la grande abondance de l'une ou l'autre espèce appartenant aux Palaecopina, aux Platycopina ou aux Eridostraca, est représentée dans la Formation des Terres d'Haurs et exceptionnellement dans les parties moyenne et supérieure de la Formation de Trois-Fontaines où elle indique des milieux lagunaires ouverts. L'écozone II, caractérisée par la présence de grands Podocopina à carapace épaisse, indique à la base de la Formation de Trois-Fontaines et dans la Formation du Mont d'Haurs, des milieux marins agités situés dans la zone d'action des vagues. L'écozone III, très riche en espèces appartenant aux Podocopina, Platycopina, Metacopina, Palaeocopina et Eridostraca, est présente exceptionnellement dans les Formations des Terres d'Haurs et du Mont d'Haurs où elle indique des milieux marins francs peu profonds. L'agitation du milieu et la variation de salinité sont les deux facteurs qui ont le plus influencé la distribution des Ostracodes de la base du Givetien à Resteigne. Leur analyse détaillée permet ainsi de préciser la nature même des rythmes régressifs élémentaires de 1ER et 2ème  ordres à la base de la sédimentation givetienne franco-belge. <i>Evlanella lessensis</i> n. sp. est fondée.","BibLvlCode":"AS","StandardTitle":"Evolution sédimentaire et Ostracodes de la base du Givetien à Resteigne (bord sud du Bassin de Dinant, Belgique)","OrigTitleLangCode":"fr","OrigTitleLangCodeExtended":"fre","OrigTitleLangID":22,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Microfacies, carbonate platform, ostracods, Givetian, Paleoecology, Microfaciès, Plate-forme carbonatée, Ostracodes, Givetien, Paléoécologie.","OtherDescriptors":null,"Notes":null,"AnaPub":1991,"MonPub":null,"DateUpdate":"2015-09-03","DateCreate":"2012-11-13","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":220026,"PubliDate":1991,"Pagination":"157-177","XtraPublOfAnaID":null,"ISBN":null,"Volume":"61","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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