70 A new concept of karst development based on hydrogeology and geophysics a) Type 1 in Boivre Valley (Bajocian, Humphriesianum biozone) Scale bar: 3 m b) Type 1 in Clain valley (Bajocian, Humphriesianum biozone) c) Type 2 at the bottom of Upper Bajocian (D8 discontinuity) at Poitiers c) Type 2 at the top of the Garantiana biozone in the Bajocian (D8bis discontinuity) Figure 8 Typology of macroporosity in middle Jurassic limestones on Poitou Threshold. Figure 9 Vuggy level in Humphriesianum zone of upper Bajocian (Saint Benoit - Passelourdin cliff).
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