144 



THE AGE OF MAMMALS 



the lacustrine deposits of St. Ouen (12) near Paris. Fissure deposits or 

 'terrains siderolithiques,' analogous to those of Egerkingen and Lissicu, 

 are represented in Heidenheim (Bavaria) (20) and Mormont near Lyons. 

 Deperet considers the beginning of the famous fissures of Quercy (19) as 



Fig. 50. — Middle Eocene. Lutetian. FRANCE. — Marnes d' 1 Argenfon (Indre), 

 lacustrine. Siderolithique de 3 Lissieu, near Lyons, fissure deposits. Calcaire grossier de 3 

 Paris, Vaugirard, 4 Nanterre, 5 Gentilly, near Paris, lotver strata marine, upper freshwater or 

 brackish. 6 Coucy, Dampleix (Aisne). 7 Les Matelles, La Leviniere, conglomerats et gr6s de 

 St. Gely du Tcsc (Herault). Grfes d' 8 Issel, Cesseras, in the Mts. Corbidres. ENGLAND. — 

 Series of clays, marls, sands, and lignites of 9 Bracklcsham (Sussex), marine (100 ft.). 

 SWITZERLAND. — Mergeln von 10 Egerkingen, in the Jura Mts., terrain siderolithique. 

 GERMANY. — Susswasserkalk von 11 Buchsweiler (Alsace). Bartonian. FRANCE.— 

 Calcaire de 12 St. Ouen, in Paris basin, lacustrine or brackish (10-20 meters). Calcaire de 13 

 Sergy (Aisne). Grfes et moUasse de 14 Castrais, Mazou, Montcspien, near Narbonne. 15 

 Lautrec (Tarn). 16 Viviers, in the Rhone valley. Marnes de 17 Robiac (Gard). Sideroli- 

 thique de 18 Mormont (in part) near Lyons. Phosphorites de 19 Quercy (a small part), in 

 south central France. GERMANY. — Bohnerz von 20 Heidenheim (Bavaria). Deperet. 



of this age. Of greatest import for our knowledge of the mammals are the 

 marl beds of Robiac (Gard) (17) in south central France, which through the 

 explorations of Deperet ^ have yielded to the Lyons Museum a splendid 

 series of remains of lophiodonts, horses, and other mammals; here was found 

 a veritable bone bed, crowded with well-preserved types. 



3. Ludian Stage. — This stage is named after the marnes de Liides 

 in the Paris Basin, but is typified by the gypse de Montmarlre (4), made 



^ Deperet and Carri^re, Sur un nouveau gisement de Mammif^res de I'Eoc^ne moyen h, 

 Robiac prfes Saint-Mamert (Gard). C. R. Acad. Sci. Paris, sea. Oct. 21, 1901, Vol. CXXXIII, 

 no. 17, pp. 616-618. 



