on the section of Brouilly it says that mont Brouilly is an extinct volcano but in the InterBeaujolais site says otherwise and also explains a different "History" about the origin of the name of the region. and also mentions the region having the most diverse soil of the "Crus" as well as Beaujolais now being a 'UNESCO Global Geopark" because of that diversity in all the 12 AOCs. https://www.beaujolais.com/wp-content/uploads/sites/2/2020/09/Carnet-Beaujolais-EN.pdf page 37 for the Brouilly information.