Periglacial field experiments in the mediterranean high mountain: the geometric microf/gurations.

Abstract

The present work develops a part of the experimental works that we are carrying out in the supraforestal level of the eastern Pyrenees. The work has been accomplished on an erosive level near the crest, in a limited zone of 340m2 at 2.170 m. of altitude. The experiments attempt to detect the movility ofstones in the periglaciar micro- figurations, mainly stone circles and sorted stripes. Systematic observations during three years verify the fonnation of decimetric geometric figures from 2.170 m., under certain parametres (mineral fraction, gradient, vegetal cover, frost-thawing cycles, etc.).