De calizas hemipelágicas a calizas de plataforma somera: un ejemplo de facies de transición en el Jurásico Medio. Sección del Sur del San Cristóbal (Subbético, Jaén)

Abstract

An excellent stratigraphic section of the Middle Jurassic showing the record of the transition facies from hemipelagic (Baños Fm) to oolitic shallow platform limestones (Jabalcuz Fm) in the Intermediate Domain of the Subbetic, is described and interpreted in terms of depositional processes. The shallow carbonate platform sedimentation, which was abandoned toward the end of the Early Liassic, was thus restored in some areas of the Southern Iberian Continental Paleomargin (SICP) in the Middle Jurassic. The described facies succession make up a shallowing-upward sequence which begins with a thick accumulation of breccias and ends with cross bedded oolitic limestones. The triggering factors of this shallowing-upward sequence were, probably, tectonics and relative sea-level fluctuations. All the described features and events took place during the rifting episode affecting the SICP from the Early Jurassic