Bedded Quaternary slope deposits in the upper Boutonne region, Deux-Sevres, France, show evidence of two successive stages of frost action. Depending on the orientation of the beds, solifluction has produced either asymmetric valleys (west bank gentle, east bank steep) or valleys "en berceau" (very gently sloping sides and flat bottoms). The Boutonne valley itself is filled with periglacial deposits as yet hardly affected by recent, preponderantly chemical, erosion.

First Page Preview

First page PDF preview
You do not currently have access to this article.