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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.
Separate groups of strata are often characterised by distinct species of nummulite; thus the beds between the lower Miocene and the lower Eocene may be divided into three sections, distinguished by three different species of nummulites, N. variolaria in the upper, N. laevigata in the middle, and N. planulata in the lower beds.
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