146 OPENINGS IN LIAS9IC AND OOLITIC ROCKS OF OXFOEDSHIEE. 



Charlbury the Inferior Oolite passed without break into the lime- 

 stones, which the author had called Great Oolite. 



Mr. Etheridge said that the paper was confined to the Evenlode 

 valley and was not extended to the country around. Ammonites 

 margaritatus was said by the author to be found in the Lower Lias ; 

 but it never occurs in that bed, being characteristic of the Middle 

 Lias. 



The Author, in reply, said that A. margaritatus occurred within 

 three feet of beds containing A. raricostatus{2). 



