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According to M. Hebert, the most characteristic Barton Clay fossils correspond to those of the Gres de Beauchamp, or Sables Moyens, of the Paris Basin, but it also contains many common to the older Calcaire Grossier. Voluta athleta, Sol. Terebellum fusiforme, Lam. Cardita sulcata, Brand. Crassatella sulcata, Sowerby. Nummulites variolaria, Lam. Var. of Nummulites radiata, Sowerby.
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