Discontinuidades y conformidades correlativas en las series hemipelágicas del final del Cretácico en el Prebético. Caracterización biocronoestratigráfica

Abstract

In the upper Santonian to Danian hemipelagic to pelagic series in the eastern part o f the Prebetic Jumilla-Callosa-Aspe area, detailed stratigraphic and biostratigraphic analyses have allowed the recognition and age-dating of three major regional unconformities and their correlative conformities. These represent major changes in sedimentation, synsedimentary tectonic, bathymetry, basin configuration and/or faunal assemblages that abruptly took place in the ancient Betic continental margin. These surfaces, based on the stratigraphic distribution of globotruncanids, can be dated (at their minimum hiatus) as latest Santonian-earliest Campanian, middle Maastrichtian and Maastrichtian-Danian boundary in age. From base to top, the following biozones have been identified: Dicarinella asymetrica, Globotruncanita elevata, Clobotruncana ventricosa, Clobotruncanita calcarata, Globotruncana falsostuarti, Gansserina gansseri, Contusotruncana contusa - Racemiguembelina fructicosa, and Abathomphalus mayaroensis. The described unconformities bound and outline two major genetic stratigraphic units, with distinctive stratigraphic and sedimentalogical features. These units configure the first subdivision o f those Upper Cretaceous hemipelagic/pelagic successions of the Prebetic in terms of genetic stratigraphy.