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This walk takes you through the Moulin Pochas falun site, which was used as a sandpit, and then continues with a short stroll across the plain through the fields. The site is not really a mill in the usual sense (such as a flour mill), but rather an ancient natural geological site consisting of falunières – quarries of ancient marine deposits (clay-sand cliffs known as faluns) – dating back some 15 million years. It is a unique testament in Poitou to the era when a shallow sea (the Mer des Faluns) covered the region. The site consists of ancient shell sand quarries containing marine fossils such as shells, corals, etc.