{"refrec":{"BRefID":219971,"RR":"<b>Bultynck, P.</b> (1986). Accuracy and reliability of conodont zones: the Polygnathus asymmetricus \"Zone\" and the Givetian-Frasnain boundary. <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 56</i>: 269-280","BEntID":211704,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":null,"RefStringPartII":". <i>Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 56</i>: 269-280","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Bultynck, P.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Bultynck, P.","Englishabstract":"Limestones from the top of the Bouia Formation, Tafilalt, southeastern Morocco, that traverse the Givetian-Frasnian boundary (base of the Lower <i>P. asymmetricus</i> Zone) were sampled several times for conodonts. In the Bou Tchrafine section near Erfoud a styliolinid coquina bed 6 cm thick was sampled five times, in each case from the whole bed at the same place. The bed immediately below belongs to the <i>Klapperina disparilis</i> Zone and the overlying one to the Middle <i>P. asymmetricus</i> Zone. The conodont fauna from the styliolinid bed varies from one sample to another and has been attributed as follows: once to the upper part of the Lower <i>P. asymmetricus</i> Zone, once to the lower part? of the Lower <i>P. asymmetricus</i> Zone and three times to an interval covering the top of the <i>K. disparilis</i> Zone?, the entire Lowermost and the lower part? of the Lower <i>P. asymmetricus</i> Zone. There is no relationship between the stratigraphic accuracy obtained and the size of the sample. In two nearby outcrops, 300 m and 600 m to the southeast, the microcoquina is thicker (15 cm and 51 cm) and composite; each bed was sampled once or twice and the zonal attribution shows the same variation as in the first outcrop. The varying results from the consecutive samplings are explained not only by the depositional environment (a condensed limestone sequence) but also by the unsatisfactory definition of conodont zones between the <i>K. disparilis</i> Zone and the Middle <i>P. asymmetricus</i> Zone. It would be appropriate to revise that part of the standard conodont zonation on the basis of non-condensed sequences.","AbstractOtherLang":"Les calcaires du sommet de la Formation Bouia dans le Tafilalt. sud-est du Maroc, contenant la limite Givetien-Frasnien (base de la Zone à <i>P. asymmetricus</i> Inférieure) ont été échantillonnés à plusieurs reprises pour l'étude des Conodontes. Dans la coupe du Bou Tchrafine, près d'Erfoud, un banc coquillier à styliolinides, épais de 6 cm, a été prélevé cinq fois, dans chaque cas sur toute l'épaisseur du banc et au même endroit. Le banc immédiatement sous-jacent appartient à la Zone à <i>Klapperina disparilis</i> et celui sus-jacent à la Zone à <i>P. asymmetricus</i> Moyenne. La faune à Conodontes du banc à styliolinides varie d'un échantillon à l'autre et est attribuée comme suit: dans un cas à la partie supérieure de la Zone à P. asymmetricus Inférieure, dans un cas à la partie inférieure? de la Zone à <i>P. asymmetricus</i> Inférieure et dans trois cas à un intervalle comprenant le sommet de la Zone à <i>K. disparillis</i>?, l'entièreté de la Zone à <i>P. asymmetricus</i> la plus Inférieure et à la partie inférieure? de la Zone à <i>P. asymmetricus</i> Inférieure. Il n'y a pas de relation entre la précision stratigraphique obtenue et la quantité traitée de l'échantillon. Dans deux affleurements proches, à 300 m et à 600 m au sud-est du premier, le banc coquillier est plus épais (15 cm et 51 cm) et composite; chaque banc a été échantilloné une ou deux fois et l'attribution zonale montre la même variation que dans le premier affleurement. Les résultats variables obtenus à partir d'échantillonnages consécutifs sont expliqués non seulement par les conditions de dépôt (une séquence calcaire condensée) mais aussi par la définition insatisfaisante des zones à Conodontes entre la Zone à <i>K. disparilis</i> et la Zone à <i>P. asymmetricus Moyenne</i>. Il serait approprié de réviser cette partie de la zonation standard à Conodontes d'après l'étude de séquences non condensées.","BibLvlCode":"AS","StandardTitle":"Accuracy and reliability of conodont zones: the Polygnathus asymmetricus \"Zone\" and the Givetian-Frasnain boundary","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":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1986,"MonPub":null,"DateUpdate":"2015-09-02","DateCreate":"2012-11-12","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":{"AnaID":219971,"PubliDate":1986,"Pagination":"269-280","XtraPublOfAnaID":null,"ISBN":null,"Volume":"56","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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