{"title":"Some new and rare upper cretaceous ammonites from north-eastern Nigeria","authors":"P.M.P. Zaborski","doi":"10.1016/0899-5362(93)90079-6","DOIUrl":null,"url":null,"abstract":"<div><p>The following ammonites are described from north-eastern Nigeria: <em>Placenticeras (Karamaites) cumminsi</em> Cragin (Upper Cenomanian), <em>Watinoceras</em> aff. <em>coloradoense</em> (Henderson) (basal Turonian), <em>Fikaites varicostatus</em> gen. et sp. nov. (Upper Cenomanian), <em>Rubroceras</em> sp. (Upper Cenomanian), <em>Kamerunoceras turoniense</em> (d'Orbigny) (Lower-Middle Turonian boundary) and <em>Eotissotia simplex</em> Barber (Lower to? Middle Turonian). The genus <em>Fikaites</em> is probably derived from <em>Eucalycoceras</em> Spath and is one of a number of ammonites independently acquiring a vascoceratid type suture pattern during Late Cenomanian and Early Turonian times.</p></div>","PeriodicalId":100750,"journal":{"name":"Journal of African Earth Sciences (and the Middle East)","volume":"17 3","pages":"Pages 359-371"},"PeriodicalIF":0.0000,"publicationDate":"1993-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0899-5362(93)90079-6","citationCount":"15","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of African Earth Sciences (and the Middle East)","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0899536293900796","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 15
Abstract
The following ammonites are described from north-eastern Nigeria: Placenticeras (Karamaites) cumminsi Cragin (Upper Cenomanian), Watinoceras aff. coloradoense (Henderson) (basal Turonian), Fikaites varicostatus gen. et sp. nov. (Upper Cenomanian), Rubroceras sp. (Upper Cenomanian), Kamerunoceras turoniense (d'Orbigny) (Lower-Middle Turonian boundary) and Eotissotia simplex Barber (Lower to? Middle Turonian). The genus Fikaites is probably derived from Eucalycoceras Spath and is one of a number of ammonites independently acquiring a vascoceratid type suture pattern during Late Cenomanian and Early Turonian times.
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