HOLOCENE EVOLUTION AND GEOARCHAEOLOGY IN THE EBRO VALLEY AROUND ZARAGOZA (NORTHERN SPAIN)

Evolution of slope, alluvial fan and filled valley systems related to the Alfocea-Juslibol escarpment are analysed. Palaeogeographic and palaeoenvironmental data obtained from this analysis can be useful in reconstructing the Upper Holocene evolution of this sector of the Ebro valley. In the Alfocea, Miranda and Se ora filled valleys, a sequence of three sedimentary stages has been established. Firstly, a well-developed stage, going from the Late Neolithic to the Late Roman Age ( 3000 BCE - 4th century CE); a second, Medieval - Post-Medieval epoch stage, and, finally, a more scarcely represented Recent stage. These data can be compared with the available geoarchaeological information from nearby areas in order to assess the climatic and/or human factors triggering the accumulation processes, as well as to evaluate the significance of the lateral movement of the Ebro River.