The data on the cartography of the existing eolic sands in the Duero Basin indicate that occupy a great extent from different levels from the north of the Cordillera Central until the Duero River. Their extension is about to the almost 2.000 km2 with a very variable thickness that arrives at least 30 m in some localities. They have been dated as formed from final times of the Upper Pleistocene until the Holocene. In this work is indicated a place (San Miguel del Arroyo) where 1 m of eolic sands covers to visigothic remains.

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