Reeent data from Chile, Cuba, southern USA, and Iberia show that the Oxfordian Plieatilis p. p.,Transversarium p. p., and Bimammatum Zones are eorrelated reliably in these areas. Signifieant for eorrelations are Dichotomosphinc tes, close forms to Gemmellarites, Gregoryceras, and the assoeiation of Euaspido ceras with Mirosphinctes andJor Praeataxioceras. Above the lower Bimammatum Zone, Cubaspidoceras, Metahaploceras and probably Geyssantia are of speeial interest. The general absenee of ammonites belonging to the Bifureatus Zone in Chile, Mexieo and southern USA, as well as their endemism in Cuba, eannot yet be eonclusively interpreted. Zusammenfassung: Neue Daten aus Chile, Cuba, den südliehen USA und Iberia gestatten die genaue Korrelation von Plieatilis p. p.,-Transversarium p. p.-und Bimammatum-Ammonitenzonen in diesen Gebieten. Wiehtig fUr die Korrelation sind Dichotomosphinctes-Formen (die Gemmellarites nahestehen), Gregoryceras und die Vergesellsehaftung von Euaspidoceras mit Mirosphinctes und/oder Praea taxioceras. In Ammonitengesellsehaften, die jünger als das frühe Bimammatum Chron sine!, haben wahrseheinlieh Cubaspidoceras Metahaploceras und Geyssantia besondere Bedeutung. Das generelle Fehlen von Ammoniten im Bifureatus-Chron in Chile, Mexiko und den südliehen USA und deren endemisehes Vorkommen in Cuba, laf3t sieh noeh nieht entseheidend erklaren.
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