40 Bulletin 15 350 



Fontanne' s sedition. M. Fontanne,* in 1884, made the fol- 

 lowing se(5lion of this region: 



5. Conglomerate. 

 Aquitanian. 4. Grey clays and limestone of Salindres. {Cyclos- 

 to)na antiquum and Rhinoceros). 

 3. Calcareous sandstone (plants). 

 Tongrian. 2. lyimestoneof Montredon(/*/a«^r/5'zj'andZ,z;7z;z<^a). 

 I, lyimestone and marls of Monteils {Cyreiia semi- 

 st7^iata). 



In the northwestern part of the Plateau, near La Li magna 

 and Montbrison, are brackish and freshwater beds. The former 

 mark the period during which the basins in which they rest were 

 conneAed with the Paris basin; the latter are isolated deposits of 

 lacustrine origin. 



In the eastern portion of the Plateau, in the vicinity of Velay, 

 freshwater limestones with Planorbis and Limncea overlie the 

 Eocene. 



Oligocene of the Sadne and Rhone valleys. Freshwater Oligo- 

 cene beds, usually limestones, with Helix Ramondi, are well de- 

 veloped along the valley of the Saone, as at Dijon, Brognon and 

 Belfort. In, Languedoc, in the southwestern portion of the val- 

 ley of the Rhone, t are upper Oligocene marine and brackish clays 

 with Potamides, 



Se£lio7i of the Oligocene of the Mainz bashi. The Oligocene 

 of the Mainz basin consists of: 



8. Limestone {Corbicula Faujasi). 



7. Limestone {Cerithium cinfiuin, C. plicatuni^ Potatnides 



Lamarcki) . 

 6. Sandstone (imprints of leaves of Quercus, Uhnus, etc.). 

 5. Freshwater and brackish clays {Cyroia semistriata, Ceri- 

 thitmi plicatum, Potamides Lamarcki, Planorbis cornu, 

 A nthracotherium alsaticum ) . 



* Description sommaire de la malacologie des formations saumatres et 

 d'eau douce du groupe d'Aix, 1884. 



t Fontanne, Etudes stratigraphiques et pal^ontologiques pour servir a 

 I'etude de la periode tertiaire dans le bassin du Rhone, 1875-1881. 



