The famous cave that you’re about to visit was hollowed out of the limestone rock at the height of the Jurassic period (Kimmeridgian, Tithonian - between 146 and 135 million years ago), and is only one branch of a huge underground network covering thirty kilometres or so.
Its history began 35 million years ago (Eocene, Tertiary period) and is still continuing today, for La Cocalière is a living cave, i.e. still in formation.
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