56 A new concept of karst development based on hydrogeology and geophysics 13 - Zigzagiceras zigzag (Ø 5.5 cm) 15 - Morrisiceras morrisi (Ø 11 cm) 17 - Prohecticoceras retrocostatum (Ø 5 cm) (Sud Deux-Sèvres) 14 - Procerites progracilis (Ø 12 cm) 16 - Cadomites bremeri (Ø 7.6 cm) 18 - Clydoniceras discus (Ø 9 cm) (Sud Deux-Sèvres)
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