La sedimentación de plataforma externa en el Cretácico Inferior de Oliva (Valencia)

An outer shelf sedimentation (near the basal wave level), characterizes the Prebetic of Alicante in Oliva (South of Valencia) from the base of the upper Valanginian to the lower part of the upper Barremian. In these monotonous lutitic sediments, by its mineralogie, type of sequences o f fossil content sediments, seven different lithologic units can be distinguished. The age has been determined by Ammonites, and two important sedimentary discontinuities are recognized. The beginning of the sedimentation is the "middle-Valanginian" drowning with an evolution towards the outer shelf. After a stage of low sedimentary rate of with abundant glauconite, it ends with a shallowing upward tendency.