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Monsieur Delbos, after much research, has determined that the cliffs at Bidart consist of the cretaceous rocks, and that these cease going northward towards Biarritz, and are succeeded by beds of the Lower Eocene. The very lowest of these, however, does not appear on the coast, namely, that which he designates as "Marnes à Terebratules." The first, which is found to the north, beyond the chalk formation on the coast, is a calcareous rock, containing a species of serpula. Mons. Delbos writes asdoi:10.1017/s1359465600003804 fatcat:l62t2mh2w5ae5kpuy73mopnh5e