Los depósitos miocenos en los alrededores de Andujar (depresión del Guadalquivir. Provincia de Jaén)

Abstract

The main fatures of the Miocene deposits, within an area of the North-Eastern border of the Guadalquivir Basin, are studied herein. This group of materials, is grouped in units: Guadalquivir allocthonous and filling of the basin units. In the Guadalquivir allocthonous units is represented the so called Olistostroma Unit that achieves a high development at the South of the studied area. The filling of the basin units are four units whose characterization allows to establish the existence of a transgressive stage (Upper Tortonian-Andalusian) in which a deltaic body (Conglomeratic Unit) with marine indentations is overtaken by backshore-foreshore deposits (Calcarenitic Unit). Overlying these materials there are deeper marine facies (shoreface- offshore) of the Mari Unit. Sorne minor tectonic pulses are recorded during this stage, displacing the frontal side of the Olistostroma to the North. A second (regresive) stage gives place to the deposit of the Sandy Unit, that consists on shallower shore facies of Middle Andalusian with features of shoreface deposits.