23 1. The Poitou Threshold L1-p: Triassic formations; o-e: “siderolic” formation (clay with ferruginous pisolite), e = lacustrine marl (Eocene); JIV-p: Mesozoic limestones, L1-IV: lower Jurassic formations; h: “houiller” = coal formations; R: rhyolite of Cholet; x: shists; ε: amphibolite; γ1: granulite; γ2: granite; δ: diorite; ξ: gneiss; π porphyry; Q: quartz - A: anticline, S = syncline. Figure 4 Structural axes of the Poitou threshold by Mathieu (1937, p. 289).
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