ABSTRACT
The low basin, over which the main rivers of depression flow: Arnoia, Tioira, Castelo and Maceda; contains sediments of several meters deep of clays, sands and loose stones, sometimes with the topsoil layer covered with pebbles (Sanz 1985).
The low basin, over which the main rivers of depression flow: Arnoia, Tioira, Castelo and Maceda; contains sediments of several meters deep of clays, sands and loose stones, sometimes with the topsoil layer covered with pebbles (Sanz 1985).