218 



LYELL'S ELEMENTS OF GEOLOGY. 



Fossils of Oolite Group. 



of the Jura, Alps, and other distant regions, where there is 

 scarcely any hthological resemblance ; and yet some of the same 

 fossils remain peculiar in each country to the Upper, Middle, and 

 Lower Oolite formations respectively. Mr. Thurmann has shown 

 how remarkably this fact holds true in the Bernese Jura, although 

 the argillaceous divisions, so conspicuous in England, are feebly 

 represented, and some entirely wanting. 



Amongst the characteristic fossils of the Upper Oolite, may 

 be mentioned the Ostrea deltoidea (Fig. 205.), found in the Kim- 

 meridge clay throughout England and the north of France, and 



FOSSILS OF THE OOLITE. 

 Fig. 205. 



Fig. 204. 



Oryphma virgula. Ostrea deltoidea^ 



Upper Oolite. 



Fig. 206. 



Trigonia gihbosa. 

 a the hinge. 

 Portland Oolite, Tisbury. 



Fig. 207. 



Fig. 208. 



JVerirKBa hieroglyphica. 

 Coral rag. 



J\rerincea Ooodhallii, Fitton. 

 Coral rag, Weymouth. 



also in Scotland, near Brora. The Gryphcsa virgula (Fig. 

 204.), also met with in the same clay near Oxford, and so abun- 

 dant in the upper oolite of parts of France as to have caused the 

 deposit to be termed " marnes a gryphees virgule." Near Cler- 

 mont, in Argonne, a few leagues from St. Menehould, these indu- 



