标题：Evolución geomorfológica, cambios ambientales e intervención humana durante el holoceno en la cuenca alta del Ebro: las tobas de los valles del Purón y Molinar
出版社：Consejo Superior de Investigaciones Científicas
摘要：Geomorphologic evolution, environmental changes and human activity during Holocene in Upper Ebro Basin: tufa complexes in Purón and Molinar rivers. Pleistocene to Holocene transition was accompanied by a very intense environmental change, from cold conditions to warmer. During this time, the karst processes made a very intense work on calcareous places of Upper Ebro Basin and tufa sedimentation rates in the valleys were also high. During the Holocene, coinciding with first human settlement occupation, tufa sedimentation stopped and the down cutting processes on in filled valley deposits started on. The erosion process on tufa building may be caused both human activity and complex responses of the natural system. In this paper Holocene geomorphic evolution of Purón and Molinar rivers is studied, the chronology of tufaceous deposits is established and the incidence of human activity on the geomorphic evolution is considered.
