54 A new concept of karst development based on hydrogeology and geophysics Plate 1 : Ammonites Unless otherwise indicated, all ammonites come from the southern Deux-Sèvres region. Collection and photos P. Branger. 1 - Leioceras opalinum 28 cm (block length) 3 - Brasilia gigantea (Ø 14.5 cm) 5 - Hyperlioceras discites (Ø 12.5 cm) (Charente) 2 - Ludwigia murchisonae (Ø 20 cm) 4 - Graphoceras concavum (Ø 13 cm) 6 - Sonninia adicra ( Ø 14 cm)
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