{{Cite conference| publisher = BRGM - Service géologique national| last1 = Thomas| first1 = Éric| last2 = Brault| first2 = Nicolas| last3 = Carn| first3 = Anne| last4 = Lecerf| first4 = Yannick| last5 = Rivière| first5 = Jean-Marie| title = Notice explicative de la feuille 351 - Ploërmel| location = Orléans| series = Carte géol. France (1/50 000)| date = 2004}}