BUDLEIGH-SALTERTON PEBBLE-BED. 331 



3. The supposed Normandy and Brittany Source of Derivation. 



A great deal has been published on the Palasozoic rocks of Normandy, Brittany, and 

 the Department of the Manche, by M. Marie Rouault, M. Bonissent, M. Moriere, and 

 M. Ch. Barrois, and especially by MM. de Tromelin and Lebesconte. 1 We need not, 

 however, refer to any of the Silurian or Devonian Rocks of Normandy and Brittany that 

 are not sandstones or quartzites similar in composition to those that occur at Budleigh- 

 Salterton. 



1st. In 1850, M. Marie Rouault discovered in Brittany a new formation in the 

 Lower Silurian, namely a sandstone which he stated to be generally white, greyish-blue, 

 or yellow, and which graduates from soft sandstone into quartzites of various degrees of 

 compactness. It contains, besides other fossils, Lingula Lesueuri, L. Brismonti, and 

 Li7igula Hawkei, Rouault. It represents the lower portion of the Lower Silurian, or, 

 according to M. de Tromelin, the base of the Llandeilo or even the " Stiper Stones." It 

 occurs at Guichen, Lion, Pontrean, Plechatel, Chateaubriand, Laille in Brittany, also at 

 Bagnoles (Orne) and elsewhere. 



1 1848. Marie Rouault. Catalogue des Fossiles du Terrain Paleozoique des Environs de Rennes, 

 Bretagne — Bull. Soc. Geol. de France, 2nd ser., vol. iv, p. 322, 1846. 

 1848. Marie Rouault. Sur la Composition du Test des Trilobites, &c. — Bull. Soc. Geol. de France, 

 2nd ser., vol. vi, p. 67, 1848. 



1850. Marie Rouault. Note preliminaire sur les Fossiles de l'FJtagedu Gres Armoricain — Bull. Soc. 



Geol. de France, 2nd ser., vol. vii, p. 728, 1850. 



1851. Marie Rouault. Sur les Terrains Paleozoiques des environs de Rennes — Bull. Soc. Geol. de 



France, 2nd ser, vol. viii, p. 358, 1851. 

 1855. Marie Rouault. Notice sur quelques especes de Fossiles du Terrain Devonien du Nord du 



Dept. de la Manche — Bull. Soc. Geol. de France, 2nd ser., vol. xii, 1855. 

 1863. Bonissent. Essai geologique sur le Dept. de la Manche, 4me epoque Terrain Devonien, 3me 



epoque Silurien — 1863. 



1875. De Tromelin et Lebesconte. Essai d'un Catalogue raisonne des Fossiles du Dept. du Maine, 



&c. — Assoc. Franc., pour l'avancem. de la Science; Congres de Nantes. 



1876. De Tromelin et Lebesconte. Observations sur les Terrains primaires du Nord du Dept. de 



l'llle-et-Vilaine et de quelques autres parties du massif Breton — Bull. Soc. Geol. de 

 France, 3rd ser., vol. iv, p. 583. 



1877. De Tromelin. Etudes de la Faune du Gres Silurien de May — Bull, de la Soc. Linn, de Nor- 



mandie, 3d ser., vol. i, p. 5, 1879. 

 1877. De Tromelin. Etudes des Faunes Paleozoiques de la Basse Normandie, particulierement dans 



les Dept. de 1'Orne et du Calvados ; Congres du Havre, 1877. 

 1877. Ch. Barrois. Note sur le Terrain Devonien de la Kade de Breste — Ann. Soc. Geol. du Nord, 



t. iv, p. 59, 1877. 



1877. <T(Ehlert. Sur les Fossiles Devoniens du Dept. de la Mayenne — Bull. Soc. Geol. de France, 



3d ser., vol. v, p. 378, 1877. 



1878. J. Moriire. Note sur le Gres de Bagnoles — Bull. Soc. Geol. de Normandie, 3d, ser., vol, ii, 



1878. 



