CHAPTEE XII. 



THE OXFORD OOLITE PERIOD. 



IN a complete form this series of argillaceous, arenaceous, and 

 calcareous strata includes the following parts : 



Kimmeridge Clay above. 



Upper calcareous grit . .. , In Yorkshire and Dorsetshire. 



Coralline oolite .... Oxfordshire, &c. 



Lower calcareous grit . Heddington. 



Upper Oxford clay . '. St. Clement's. 



Middle Oxford clay . . Oxford. 



Kello way rock . . Wilts. 



Lower Oxford clay . .- North of Oxford. 



Cornbrash below. 



Of these, the upper calcareous grit is hardly traceable near 

 Oxford, and is best seen near Malton ; and the Kelloway rock 

 is most fully explored at Hackness, near Scarborough, but scarcely 

 known in the drainage of the Thames. The Oxford clay in the 

 vicinity of St. Ives has been found to contain distinct stone beds 

 above the Kelloway band, but they do not openly occur in the 

 country round Oxford, though some evidence of such was found 

 in the deep boring at Wytham. 



OXFORD CLAY AND KELLOWAY ROCK. 



Except in wells, brick-yards, and road-cuttings, the thick argilla- 

 ceous deposit which is the base of the Oxonian series is rarely 

 seen to advantage in the interior of England." On the coasts of 



