In this work, preliminary chronostratigaphic features of the Upper Pleistocene-Holocene morphosedimentary
alluvial unit covering the bottom of the Bardena Blanca depression are described. This unit is made up by
1) gravels and sands related to a braided channel system, 2) laminated sands and clays accumulated in
distal flats of alluvial fans and 3) clays and gypsums corresponding to a playa-lake environment. According
the first chronological data supplied by OSL and 14C the age of this sequence ranges between 18 and 5 ka.
The prevailed paleoclimatic conditions were cold and humid during Last Glacial Maximum-Oldest Dryas
and arid during Lower Holocen
