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The gypsum, with its associated marls before described, is in greatest force towards the centre of the basin, where the calcaire grossier and calcaire silicieux are less fully developed. In some parts of the Paris basin, sands and marls, called the Gres de Beauchamp, or Sables moyens, divide the gypseous beds from the calcaire grossier proper.
Imperfection of the Record. Calcaire Silicieux. Gres de Beauchamp. Calcaire Grossier. Miliolite Limestone. Soissonnais Sands. Lower Eocene of France. Nummulitic Formations of Europe, Africa, and Asia. Eocene Strata in the United States. Gigantic Cetacean. Map of the principal Eocene areas of North-western Europe, showing: Shaded dotted: Hypogene rocks and strata older than the Devonian.
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