430 



STKATIGKAPHICAL GEOLOGY 



5 t2 



IS 



+3 m 



^ 



Normandy, the southern, border of the Ardennes, and the broad 

 outcrop on the borders of France and Germany, extending south- 

 ward to the Jura Mountains. 



In Normandy the succession is as follows : 



Marly limestone and blue clay, 12 feet ( = Cornbrash). 



Bryozoan limestone with Waldheimia (Zeilleria) digona, Terebra- 



tula flabellum, and Eudesia cardium, 30 feet ( = F. Marble). 

 Compact oolitic limestones with Lucina bcllona, 30 to 60 feet 



(= Great Oolite). 



Caen limestone with Rhynchonella (Acanthothyris) spinosa, pass- 

 ing northward into Bessin limestone with Oppelia fusca, 100 



feet ( = Fuller's Earth). 



White Oolite with Parkinsonia Parkinsoni, 60 feet. 

 Ferruginous Oolites with Cosmoceras subfurcatum and Strenoceras 



garantianum, 2 feet. 

 [ Brown Oolite with Cixloccras Blacjdeni, 1 foot. 



Glauconitic limestone with Sphceroceras, 1 foot. 

 I White limestone with flints, Ludwigia Murchisonce, and Lima 



heteromorpha, 9 feet. 

 Limestone with Lioceras opalinum and a layer of phosphatised 



Ammonites derived from the Toarcian at the base, 2 feet. 



On. the other side of France, in the French Ardennes and thence 

 eastward into Lorraine, the series presents a different facies with a 

 much thicker development of limestones. The succession there is : 



'Platy limestone with large Oysters (Ostrea flabelloides), 15 feet. 

 Marly limestone with Waldheimia digona, Eudesia cardium, and 



Nucleolites ( = Echinobrissus) clunicularis, etc., 100 feet. 

 White chalky limestones and oolites, 200 feet. 

 Oolite with Clypeus Ploti, 30 feet. 



Yellow sandy limestones with Parkinsonia Parkinsoni and Ostrea 

 ^ acuminata, 60 feet. 

 - . ( Yellow limestone with Pteria ornata. 

 a "S I Oolitic limestones and marls with Coeloceras Bla-gdeni. 

 o*~ \ Marly limestones with corals, Selemnites giganteus and Sonninia 

 '5o Sowerbyi. 



PQ co ^Thin b e( j -w'ith Lioceras opalinum. 



In the French Jura the succession is somewhat similar, but 

 differs somewhat in zonal detail, being as follows : 



'Platy limestones with large oysters, Waldheimia (Zeilleria) digona 



and Nucleolites clunicularis, 26 to 120 feet. 

 Compact white limestones with Rhynchonella decorata, 200 feet 



( = Great Oolite). 



Marly limestone with Pholadomyas ~\ Fuller's Earth 

 Marls of Vesoul with Ostrea acuminata j (130 feet). 

 White Oolite with Cosmoceras subfurcatum, 20 feet. 

 .. . ( Marls with Selemnites giganteus. 

 3 "8 Crinoidal limestones with Emeleia polyschides, Witchellia, and 

 "" -j Lioceras concavum. 



Ferruginous limestone with Ludwigia Murchisonce and Lioceras 

 opalinum. 



