remerciements, M. Jules Welsch, professeur de géologie à l'Université de Poitiers, 86, Vienne, dos simple, vierge

These cookies are essential to the operation of many of our services.

Some of these cookies are also necessary to ensure the security of our website, for example in order to fight fraud.

These essential cookies are placed as soon as you access the site because they are required for navigation.

These cookies collect information about your viewing and search choices and preferences to make your browsing experience more enjoyable and personalized.
You may decline the use of these cookies.

These cookies are used to collect information about your use of the site in order to improve its content, make it more relevant to your needs and increase its usability.

They also allow us to evaluate the effectiveness of our marketing campaigns.
You can refuse cookies if you want to browse our website.

These cookies enable you to share content on social networks and view YouTube videos directly on our pages. They also enable YouTube and the social networks to track your browsing, cross-reference this data with your profile on their respective platforms, and thus target their advertising offers according to your centers of interest.

You may refuse the use of these cookies.