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Radiolites foliaceus, d'Orbigny. Syn. Sphaerulites agarici-formis, Blainv. Hippurites organisans, Desmoulins. Upper chalk: chalk marl of Pyrenees? Young individual; when full grown they occur in groups adhering laterally to each other. b. Upper side of the upper valve, showing a reticulated structure in those parts, b, where the external coating is worn off. c.
Inferior or attached valve. Pecten Beaveri, Sowerby. Reduced to one-third diameter. Lower white chalk and chalk marl. Lima spinosa, Sowerby. Syn. Spondylus spinosus. Ostrea vesicularis. Syn. Gryphaea convexa. Inoceramus Lamarckii. Syn. Catillus Lamarckii. Radiolites Mortoni. Mantell. Houghton, Sussex. White chalk. Diameter one-seventh natural size. The upper or opercular valve is wanting.
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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