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The Guadix-Baza basin is one of a number of intramontane depressions located within the Betic Cordillera (SE Spain), where the geological and geomorphological evolution is controlled by tectonic activity. The basin ceased to be closed after capture by the Atlantic network, when five main land systems developed. Late Pleistocene geological evolution basically consisted of erosional modelling, when badlands were deeply incised in highly erodible materials (marls and silts). Three travertine platforms and several Palaeolithic sites were used to determine that this main incision period fell within a 115,000-48,000 yr range. There are few signs of geomorphological evolution of this basin in the last 48,000 yr. Based on these geomorphological data and soil development, tectonic uplift of the basin probably played a secondary role in its evolution, and climatic conditions in southern Iberia in the 144,000-48,000 yr period were more humid and variable than later. (c) 2006 University of Washington. All rights reserved.