La Formación Areniscas de Ciudad RodrigoEjemplo de sedimentación controlada por paleorrelieves (Eoceno, fosa de Ciudad Rodrigo)

Abstract

In the southeastern Ciudad Rodrigo there is a conspicuous sandstone unit that has been usually refered to as «Serie» de Ciudad Rodrigo. The purpose of this paper is to define this Lithostratigraphic Unit: Ciudad Rodrigo Sanstone Formation. This Unit consist of clastic sediments derived from the weathered metamorphic and plutonic rocks placed in NW, SW and S of the basin. Paleocurrent measurement reveal a convergent pattern which coupled with the existent paleo reliefs towards the NE, suggest and endorheic basin that was progresively filled up by alluvials fans sediments. From the analysis of the present day distribution of deposits it is proposed that the development of alluvials fans was controlled by the paleo-reliefs that closed the Noreastern edge of the basin during Eocene times.