540 J. F. BLAKE ON THE UPPER 



Pig. 12. — Map of the Country round Bourges. (Scale 1 : 160,000.) 



graphic limestone over a breadth of 20 kilometres, and to show 

 no signs of the lower limestone of Coulanges and La Charite. 

 Boulanger and Bertera, indeed, mention a coral limestone below the 

 lithographic, to be seen near Venesme, which may represent it ; but 

 they correlate it with beds with Amm. hecticus, in which case it must 

 be Oxfordian. 



In the last traverse of this range the swallowing up of all portions 

 of this series into uniform lithographic limestones, below, at least, the 

 Astartian beds, is carried to its maximum ; for though, near Chapelle, 

 the white limestone of the old Chateau quarries is still seen to be 

 developed, it is much diminished in thickness, and the whole of the 

 weary way from that locality to Chateauneuf-sur-Cher, along the 

 borders of the river, is occupied by a dreary monotony of thick- 



