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Between Poitiers and La Rochelle, the space marked A on the map separates two regions of chalk. This space is occupied by the Oolite and certain other formations older than the Chalk and Neocomian, and has been supposed by M. E. de Beaumont to have formed an island in the Cretaceous sea. Cretacee du S.-O. de la France Mem. de la Soc. Radiolites radiosa, d'Orbigny. White chalk of France. b.
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