{"refrec":{"BRefID":233673,"RR":"<b>Casier, J.-G.; Lethiers, F.; Préat, A.</b> (2002). Ostracods and sedimentology of the Devonian-Carboniferous stratotype section (La Serre, Montagne Noire, France). <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 72</i>: 43-68","BEntID":225359,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":null,"RefStringPartII":". <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 72</i>: 43-68","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Casier, J.-G.; Lethiers, F.; Préat, A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Casier, J.-G. <i>et al.</i>","Englishabstract":"Despite their low abundance, ostracods are very diversified in the La Serre Devonian-Carboniferous (= D-C) Global Stratotype Section and Point (= GSSP). Seventy-one species are identified, 58 in the Devonian and 29 in the Carboniferous. The ostracod fauna is composed of ostracods belonging to the Eifelian ecotype alone or to a mixed assemblage of the Eifelian and Thuringian ecotypes. The relative abundance of these two ecotypes, the abnormal number of instars in some beds, the presence of ostracods in oolites and the occurrence of reworked specimens in elements of microbreccia give evidence for important changes in the conditions of the environment close to the D-C boundary. In the Late Devonian, ostracods display a regressive trend from deep environments below storm wave base to highly agitated environments above fair-weather wave base. But the sea level curve is not completely recorded in the La Serre section since two tectonic disturbed beds are present in the upper part of the profile. The number of ostracod species disappearing during the Hangenberg Event at La Serre seems to be less important in comparison with other sections investigated in Germany and Poland.The sedimentological study displays a standard sequence composed of six carbonate microfacies (MFI to MF6) and shows a quite abrupt transition from shallow hemipelagic environments (MFI) to shoreface-foreshore microbioclastic and ooidal shoals (MF2-MF5) reaching the upper beach foreshore (MF6). No evidence of subaerial emergence is found, nor any sedimentary structures indicating intertidal restricted environments. Microbreccias are abundant in MF5 and MF6; they are moderately to poorly sorted, subangular to subrounded, and show mixing of different eroded microfacies. All this supports strong and brief erosional phases within the transitional zone around 10 m water depth.The sea level trend points to a general regression starting near the Hangenberg Horizon <i>sensu</i> FEIST et al. (2000), from our sample 37 (Fig. 2), to the top of the section (sample 64) as showed by the shift of microfacies 1 to microfacies 6 and the quite abrupt appearance of proximal coquina layers, interpreted tempestites, toward the upper part of the section. The energy level was very high as indicated by the broken oolites, the microbreccias and the lamination patterns. Finaly a sea level increase (transgression) seems to have occurred in the uppermpost pan of the profile. Sea-level fluctuations were probably about ten of meters or more, as indicated by the erosion of microfacies 1 whose fragments form part of the microbreccias of microfacies 6.The study of ostracods and the sedimentology confirm that the La Serre section is far from being an ideal GSSP.","AbstractOtherLang":"Malgré leur faible abondance, les ostracodes sont extrêmement diversifiés dans le stratotype de la limite D-C de La Serre. Soixante et onze espèces sont identifiées, 58 dans le Dévonien et 29 dans le Carbonifère. La faune est composée d'ostracodes appartenant soit à l'écotype de l'Eifel seul, soit à un mélange des écotypes de l'Eifel et de Thuringe. L'abondance relative des ostracodes appartenant à ces deux écotypes, le nombre anormal de formes larvaires dans certains niveaux, la présence d'ostracodes au sein d'oolites et l'existence d'ostracodes remaniésdans des éléments de microbrèches attestent d'importants changements des conditions environnementales près de la limite D-C. Dans le Dévonien final, les ostracodes témoignent d'une tendance régressive à partir d'environnements profonds, sous le niveau d'action des vagues de tempêtes, à des milieux très agités, dans la zone d'action des vagues de beau temps. La variation du niveau marin n'est cependant pas enregistrée de manière complète car deux bancs à contact tectonique anormal sont présents dans la partie supérieure du profil. Le nombre d'espèces d'ostracodes disparaissant pendant l'Evénement Hangenberg à La Serre, semble moins important que celui observé dans d'autres coupes étudiées en Pologne et en Allemagne.L'analyse sédimentologique de la coupe de La Serre permet de définir une séquence standard composée de 6 microfaciès carbonates. Leur succession (de MF1 à MF6) enregistre une diminution assez brutale de la profondeur d'eau depuis des milieux hémipélagiques situés sous la zone d'action des tempêtes majeures (MF1) jusqu'aux milieux d'avant-plage peu profonds soumis à de violents courants (MF6). Ces processus de remaniements sont à l'origine de l'érosion et de la bréchification des environnements littoraux (barres tidales bioclastiques et oolitiques...) ou hémipélagiques peu profonds. Le domaine littoral est situé à une dizaine de mètres de profondeur d'eau dans la zone photique. Aucun milieu restreint, ni émergé, n'a pu être mis en évidence.La courbe lithologique établie à partir de la succession des microfaciès met en évidence une évolution régressive du niveau marin depuis la base de la section jusqu'à son sommet. Le niveau marin semble augmenter (évolution transgressive) ensuite dans l'extrême sommet de l'affleurement. Le contexte énergétique général est très élevé comme l'indique l'abondance des microbrèches formées à partir de l'érosion des MFI-5, des fragments anguleux d'oolites et les niveaux coquilliers représentant des tempestites proximales. Les structures laminaires planes parallèles ou entrecroisées et les granuloclassements soulignent également les fortes variations d'intensité et de direction des courants.Les études ostracodologique et sédimentologique confirment que la coupe de La Serre est loin de fournir un stratotype de limite idéal.","BibLvlCode":"AS","StandardTitle":"Ostracods and sedimentology of the Devonian-Carboniferous stratotype section (La Serre, Montagne Noire, France)","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-02 08:33:14.980000","timezone_type":1,"timezone":"+00:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Ostracods, Sedimentology, Devonian-Carboniferous boundary, GSSP, Montagne Noire","OtherDescriptors":null,"Notes":null,"AnaPub":2002,"MonPub":null,"DateUpdate":"2014-02-17","DateCreate":"2014-02-17","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":233673,"PubliDate":2002,"Pagination":"43-68","XtraPublOfAnaID":null,"ISBN":null,"Volume":"72","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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