During the Magdalenian, rock shelters were visited repeatedly. The accumulation of archaeological layers reflects multiple occupation of the same site.
These visits, however, should not be thought of merely in terms of length; on certain occasions, a number of Magdalenians came at once. This can be seen at the Roc-aux-Sorciers site, whose layout and wall art – located in an imposing setting and intended for remote viewing – appear to be destined for larger groups. The major extension to the rock shelter could accommodate several dozen individuals simultaneously. Roc-aux-Sorciers fulfils most of the criteria for an aggregation site as defined by Margaret Conkey: a large surface area, a strategic location, a density of individuals, a quantity of symbolic creations (portable art, ornaments, wall art) and the reuse of the site (Conkey, 1989; Celérier, 1992).