Abstract
We are, now, sure of the existence af al least on glacial period. The surface reliefs evolving with cold weather have developped and are going on devello- ping according to severe climate conditions, to mediterranean influence and to litho- logical conditions. Spheres and boulders-important in number — constitute the rock mass of one glacial -rocks period and of block overflows, all of wich cause landslips over arenas tilled up with water. The presence of which arenas explain landslips, solifluxion and gelifluxion phenomena, together with the existence of peats-bogs. The ageing aspect of these mountains originales from the latter. Thus it must be a structural ageing which annihilates the effects of repeated erosion connected with the pasture ground and the neotectonic modifications.
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