Biostratigraphical characteristics of the oligocene sequences on North-Eastern Spain (Ebro and Campins Basins)

Abstract

A preliminary report on the work developed in the last years in the continental beds in the Ebro basin is presented. The find of more than twenty new localities with micromammal remains and the new samplings in some older ones (Santpedor, Calaf, Tarrega, etc.) enable us the establishment of a continuous sequence with good stratigraphic control from the Upper Eocene (Sant Cugat de Gavadons) to the Lower Miocene (Sta. Cilia). Eleven range zones, covering the mentioned time span are defined: Theridomys golpeae, T. aH. aquatilis, T. calafensis, T. major, T. aH. major, Eomys zitteli, E. major, E. aft. major, Rhodanomys transiens, R. schlosseri and Ebromys autolensis. More intensive sampling, particularly between the Theridomys major and the Eomys zitteli zones, is needed in the future to arrive to a continuous section covering the whole Oligocene.