55 2. The stratigraphy of the Middle Jurassic 7 - Witchellia romanoides (Ø 10 cm) 9 - Stephanoceras scalare (Ø 16.5 cm) 11 - Garantiana garantiana (Ø 6 cm) 8 - Sonninia propinquans (Ø 14 cm) 10 - Strenoceras niortense (Ø 5.3 cm) 12 - Parkinsonia parkinsoni (Ø 19 cm)
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