the Environs of Paris. 35 



upon the oolite limestone, having a slaty structure in its 

 higher parts, that extend towards Caen.+ 



sections of this coast see my paper in the 1st volume of the Geological 

 Transactions, 2nd series. The limestone mentioned by M. d'Halloy 

 would appear to belong to the coral rag series, and therefore is not neces- 

 sarily connected with the clay of the green sand formation, though they 

 may frequently come together, the intervening beds being wanting. 

 (Trans.) 



+ The upper slaty part is forest marble ; the Caen freestones occupy 

 the same geological position as the Bath or great oolite. (Trans.) 



c 2 



