5 Contents Prefaces 9 Foreword 11 T. Gaillard and J.-L. Mari The authors 13 Introduction 15 T. Gaillard and J.-L. Mari Chapter 1 • The Poitou Threshold 19 T. Gaillard and P. Branger Location and definition 19 Tectonic structure of the Poitou Threshold: a brief history of knowledge 21 Sedimentary coverage 28 Poitou threshold definition 31 References 32 Chapter 2 • The stratigraphy of the Middle Jurassic 37 P. Branger, T. Gaillard and H. Geairon Paleontological division of the Middle Jurassic 37 Deposit sequences 38 Stratigraphy of the Middle Jurassic on the Poitou Threshold 40 Aalenian 40
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