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Planktonic foraminifera from 53 samples coming from Tomares (El Aljarafe, Sevilla) were investigated, allowing the identification of three biozones: GloborotaJ&#250;l margaritse-Globoquadrina dehiscens Zone, Globorotalia puncticuJats s.l. Zone and Globorotalia crassaiormis Zone. The first one is assigned to the Upper Messinian and otbers to tbe Zanclian. The first evolutionary appearance of Globorotalia puncticulata sphericomiozea is virtually syncbronous with the extinction of Globoquadrina debiscens and the last event may serve as useful criteria in determining the position of the Miocene-Pliocene boundary. El estudio de los foramin&#237;feros planct&#243;nicos contenidos en 53 muestras recogidas en Tomares (regi&#243;n de El Aljarafe, Sevilla), ha permitido reconocer tres biozonas: zona de Globorotalia margaritse-Globoquadrina debiscens, zona de Globorotalia puncticulata s.l. y zona de Globorotalia crassaformis. La primera biozona citada se asigna al Messinense superior y las restantes al Zanclense. La primera aparici&#243;n de Globorotalia sphericomiozea coincide en estos materiales con la extinci&#243;n de Globoquadrina debiscens. Este &#250;ltimo dato ha sido utilizado en el presente trabajo para marcar el l&#237;mite Mioceno-Plioceno

Determinación del límite Mioceno-Plioceno y reconocimiento del Plioceno Inferior en Tomares (Sevilla)