El Alto nivel aluvial, en este sector del litoral de Huelva, es el pri¬mer indicador de la instauración de la red fluvial cuaternaria; con ríos de cursos entrelazados, mayoritariamente, y variaciones locales de tipo meandriforme condicionadas por el paleorrelieve previo.
The upper alluvial level from Hueiva littoral, southern Spain, re¬presents the first indication of a fluvial quaternary environment, with platform and terrace landforms. This deposit lies over the pliocene paleorelief, which shows an alteration phenomenon with laterite pro¬files. The fluvial deposits are mainly braided with channel and bar facies although some meandering sequences may be formed as result of a topographic control.