In the context of systematic research into the old desert of a chartreuse founded at the beginning of the XIIth s in a Vercors valley, the Ecouges, the excavation focused on a stone structure discovered in prospecting in the mountain area running at the top of the valley, at an altitude of 1 400 m. Three surveys with a total surface area of 75 m² revealed a rectangular building with a length of 19 m for 13.5 m wide, supported against a small cliff and marked by powerful walls of 1 m thick...