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Combined sedimentary facies, geochemical analyses and pollen spectra from lake records and sedimentological and palynological studies from slope deposits allow the characterization of vegetation and lake level status during glacial times in the central Ebro valley (NE Spain). These records show the presence of some increased effective moisture periods while regional vegetation was dominated by steppe taxa. The longest lake record comes from La Salineta, one of the saline lake in the Los Monegros area; the other lake sequence comes from a sinkhole in the Gállego river floodplain. The slope deposit from Valmadrid is the only periglacial deposit found in the central Ebro valley. Our data indicate that-at least for some intervals during full glacial times-when cold steppe vegetation dominated the region, some lakes experienced more positive water balance than today and runoff was also high. The data are coherent with the hypothesis that-at least for some periods-the ice-age climate of the western Mediterranean was characterized by cold winters, relative intense winter precipitation and summer droughts. Increased flow from the Pyrenean rivers during the early deglaciation could also play a significant role in the paleohydrological conditions in the central Ebro valley. However, La Salineta records also show the occurrence of arid periods during glacial times, indicating a complex picture of hydrological and moisture evolution in the central Ebro valley during the LGM.

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Structure des grands bassins glaciaires dans le nord de la péninsule ibérique : comparaison entre les vallées d'Andorre (Pyrénées orientales), du Gallego (Pyrénées centrales) et du Trueba (Chaîne cantabrique) Structure of the large glacial basins in the northern Iberian Peninsula, a comparison study: Andorra (Eastern Pyrenees), Gallego (Central Pyrenees) and Trueba (Cantabric range