The Salignan mill, a former windmill that has lost its sails and conical roof, houses a small permanent geological exhibition on the division of time in geology and the Aptian stage. Location: Apt Site type: Cultural site - Museum, Scenic viewpoint Visit duration: 1 h30 The Salignan mill is situated on a hill composed of gray marl known geologically as the "Aptian marls." Established in 1840 by Alcide d’Orbigny, the Aptian is one of the stages of the international stratigraphic scale. The site also offers a panoramic 360° view, stretching from the Luberon to Mont Ventoux. Inside the mill, the exhibition explains how early geologists, through the study of rocks and fossils, gradually unraveled Earth's history. It also details why Alcide Dessalines d’Orbigny chose [...]