SPANISH JOURNAL OF PALAEONTOLOGY The Ventian mammal age (Latest Miocene): present state
نویسندگان
چکیده
The Ventian land mammal age includes most of the Spanish faunas assigned to the biochronologic unit MN 13. It is correlatable with the Messinian, although it may include, in its latest part, early Pliocene faunas. We propose that the Ventian begins with the fi rst occurrence of the Muridae genus Stephanomys (7 Ma, paleomagnetic dating from El Bunker, Teruel basin), well recorded in Teruel basin, and ends with the appearance of Promimomys (ca. 5 Ma), also registered in the Teruel basin. We suggest a new reorganization of the Ventian. The fi rst subdivision corresponds to the zone M (Dam et al., 2001). The second, zone N, is proposed here for the fi rst time, being equivalent to the zone with Celadensia (Mein et al., 1990; Dam et al., 2006) plus the part of the zone with two Paraethomys (Dam et al., 2006) in which Celadensia has dissappeared and still does not register Promimomys. The Ventian is now accurately recognized with quite precise boundaries and divisions, so that it can be easily recognized RESUMEN La edad de mamíferos terrestres Ventiense incluye la mayoría de las faunas españolas de la unidad biocronológica MN 13. Se correlaciona con el Messiniense, aunque su parte fi nal puede incluir faunas de edad Plioceno basal. El Ventiense comienza con la primera aparición del genero de Muridae Stephanomys (7 Ma; datación paleomagnética de El Bunker, cuenca de Teruel), y termina con la aparición de Promimomys (ca. 5 Ma), ambas registradas en la cuenca de Teruel. En este trabajo proponemos una nueva organización del Ventiense. Una primera división correspondiente a la zona M (Dam et al., 2001), y una nueva zona denominada N, equivalente a la zona con Celadensia (Mein et al., 1990; Dam et al., 2001) más la parte de la zona con dos Paraethomys (Dam et al., 2006) en la que Celadensia ha desaparecido y aún no se registra Promimomys. El Ventiense es ahora reconocido con límites y divisiones precisas, de forma que puede ser fácilmente reconocible en las cuencas continentales Ibéricas MORALES, PELÁEZ-CAMPOMANES, ABELLA, MONTOYA, RUIZ, GIBERT, SCOTT, CANTALAPIEDRA & SANISIDRO 150 con sedimentos Mio-Pliocenos permitiendo unas correlaciones intra e inter cuenca detalladas. Palabras clave: Biocronología, Península Ibérica, cuencas continentales, Messiniense. in the Iberian continental basins with Mio-Pliocene sediments allowing refi ned intraand inter-basin correlations.
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