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                  <mods:namePart>Sopeña, Alfonso</mods:namePart>
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                  <mods:namePart>Sánchez Moya, Yolanda</mods:namePart>
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                  <mods:namePart>Barrón, E.</mods:namePart>
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               <mods:abstract>Triassic carbonate rocks of the western Cantabrian Mountains, northern Spain, have long been attributed to the Muschelkalk faciès, and as such have been correlated with other Middle Triassic carbonate units of the Iberian Peninsula. Data on palynological assemblages here presented, point to a Ladinian-lower Carnian age of the upper part of the Buntsandstein faciès in this area. In addition, the 87Sr/86Sr ratio of the limestones formerly attributed to the Muschelkalk faciès indicates a Norian or Norian-Rhaetian boundary age. These findings also imply that the position of the marine coast during the Middle Triassic Tethys transgression should be moved to a more easterly position, in the Basque Country.Las rocas carbonatadas triásicas que afloran en la zona occidental de la Cordillera Cantábrica en el norte de España, han sido tradicionalmente atribuidas al Muschelkalk por correlación con las unidades carbonatadas del Triásico Medio de otras áreas de la Península Ibérica. Las asociaciones palinológicas encontradas en la parte superior de las facies Buntsandstein que afloran en esta área, indican una edad Ladiniense-Carniense inferior. La relación 87Sr/86Sr de los niveles de calizas atribuidos anteriormente al Muschelkalk, son propios de los carbonatos de edad Noriense o Noriense-Rhetiense. Estos datos implican, además, que la posición de la línea de máximo avance del mar del Tethys hacia occidente durante el Triásico Medio se situó en una posición más oriental y dentro del País Vasco.</mods:abstract>
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                  <mods:title>New palynological and isotopic data for the Triassic of the western Cantabrian Mountains (Spain)</mods:title>
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