{"refrec":{"BRefID":233729,"RR":"<b>Casier, J.-G.; Préat, A.</b> (2003). Ostracods and lithofacies of the Devonian-Carboniferous boundary beds in the Avesnois, North of France. <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 73</i>: 83-107","BEntID":225415,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":null,"RefStringPartII":". <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 73</i>: 83-107","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":"Seven major carbonate microfacies are defined in the Devonian-Carboniferous (D-C) transitional strata (90 m) of the Bocahut quarry (Avesnes \"basin\"), and ten levels ranging through the Epinette, Etroeungt, Avesnelles and Hastiere formations are recognized. The \"bathymetric\" sequences range from open marine spiculite, below the storm wave base to semi-restricted lagoon. A standard sequence records a shallowing-upward trend, from environments below the storm wave base to strongly eroded supratidal pre-evaporitic environments. Faunal components (echinoderms, brachiopods...) point to an open marine domain for the first six microfacies. Except for the \"black\" mudstones of microfacies containing rare algae, the environment is located within the dysphotic-euphotic zone.Ostracods are abundant and diversified throughout the studied section. Sixty-six species are identified and belong to an assemblage of the Eifelian ecotype indicating oxygenated shallow marine environments generally between storm and fair-weather wave bases. The absence of some platycopid ostracods at the base of the Hastiere Formation could be related to the hiatus observed between the Avesnelles and Hastiere formations. That hiatus probably corresponds to the Hangenberg Event; however, its effect on the distribution of ostracods was very reduced.Ostracods and sedimentology show that the Bocahut quarry displays the most complete succession presently known through the D-C transition in Northern France (Avesnes \"basin\") and Southern Belgium (Dinant basin) although it is far from being continuous.Two new species are described: <i>Saccelatia? advena</i> nov. sp. and <i>Healdianella dorsosulcata</i> nov. sp.","AbstractOtherLang":"La carrière Bocahut (Avesnes-sur-Helpe) entame depuis quelques années les couches de la limite Dévonien-Carbonifère (D-C) qui dans l'Avesnois étaient actuellement mal exposées. Sept familles de microfaciès carbonates (séquence standard MF1 à MF7) sont déterminées et leur succession enregistre une diminution progressive (MF1 à MF6) de la profondeur d'eau depuis des milieux de rampe externe silico-carbonatée (une soixantaine de mètres d'eau) jusqu'aux environnements carbonates de rampe interne de faible profondeur, parfois soumis à une diagenèse vadose. Le microfaciès 7 est érosif et traduit une diminution brutale de la tranche d'eau avec remaniement important de faciès lagunaires semi-restreints. Les variations de salinité sont la règle depuis des saumures hypersalines de reflux jusqu'aux milieux saumâtres. L'étude des microfaciès permet de reconnaître dix niveaux dans les formations d'Epinette, d'Etroeungt. d'Avesnelles et d'Hastière. Les variations bathymétriques vont des faciès de lagon semirestreint jusqu'au marin ouvert franc, spiculitique situé sous la zone d'action des tempêtes. Excepté le sommet ponctuel de la Formation d'Avesnelles où le milieu devient temporairement dysoxique à anoxique, l'environnement général est oxygéné, de faible profondeur. La distribution des organismes est liée aux variations de l'énergie (vagues de tempêtes ou houle permanente), dans un système de rampe, ou aux fluctuations de salinité, dans celui de plate-forme. La transition des formations d'Avesnelles et d'Hastière est marquée par une brutale baisse eustatique qui érode une partie inférieure de la Formation d'Hastière. A cette évolution correspond l'installation temporaire d'une plate-forme semi-restreinte.Les ostracodes sont abondants et diversifiés dans la série étudiée. Soixante-six espèces sont identifiées et elles appartiennent à l'écotype de l'Eifel. Les différents assemblages indiquent des milieux marins francs bien oxygénés généralement entre la zone d'action des vagues de beau temps et de tempêtes. Les milieux les moins profonds sont situés dans la Formation d'Hastière, comme l'atteste la présence d'abondants Paraparchitacea et Aparchitacea. Aucune association d'ostracodes typiques de milieux mal oxygénés ou lagunaires n'est présente dans la coupe étudiée, bien que de tels environnements aient été ponctuellement mis en évidence au cours de l'analyse sédimentologique. Seule l'absence de quelques espèces d'ostracodes appartenant aux Platycopida à la base de la Formation d'Hastière, pourrait témoigner de l'hiatus observé à la limite entre les formations d'Avesnelles et d'Hastière. Celui-ci pourrait correspondre à 'événement Hangenberg, qui n'aurait par conséquent quasi aucune influence locale sur la distribution des ostracodes.Les ostracodes et la sédimentologic montrent que la carrière Bocahut expose la succession la plus complète connue à ce jour au niveau de la limite D-C dans le nord de la France (\"bassin\" d'Avesnes) et le sud de la Belgique (Bassin de Dinant), bien qu'elle soit loin d'être continue.Deux nouvelles espèces sont fondées: <i>Saccelatia? advena</i> nov. sp. et <i>Healdianella dorsosulcata</i> nov. sp.","BibLvlCode":"AS","StandardTitle":"Ostracods and lithofacies of the Devonian-Carboniferous boundary beds in the Avesnois, North of France","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-02 08:58:19.190595","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Ostracods, Sedimentology, Devonian-Carboniferous boundary, Avesnois, France","OtherDescriptors":null,"Notes":null,"AnaPub":2003,"MonPub":null,"DateUpdate":"2014-02-19","DateCreate":"2014-02-19","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":233729,"PubliDate":2003,"Pagination":"83-107","XtraPublOfAnaID":null,"ISBN":null,"Volume":"73","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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