PROCEEDINGS OF THE COTTESWOLD CLUB 



69 



Impervious 



Rocks 



236^ sq. ms. 



Pervious 

 Rocks 

 ^ sq. ms. 



passes over the Great Oolite and Cornbrash to near 

 Hampton Grey. From Hampton to Kidlington, Islip, 

 and Water Eaton, the Cherwell runs over the Oxford 

 Clay, and half-a-mile below the City of Oxford enters the 

 Thames. 



The accompanying table of the 13 divisions of the 

 Jurassic Rocks drained by the Cherwell are, for the sake 

 of clearness, arranged under their Impervious and Per^ 

 vious groups. 



The Lower Lias - 

 Middle „ - 

 Upper ,, 

 Oxford Clay - 

 Kimmeridge Clay - 



The Inferior Oolite 



Great ,, 



Forest Marble 



Cornbrash 



Lower Calc. Grit - 



Coral Rag 



Portland Oolite and 

 Sands 

 The Lower Green Sand 



L 



I 



Sub-basin of the Swere 



This well defined area is drained by the Swere, which 

 is a considerable tributary to the Cherwell on its western 

 side. One branch rising near Hook Norton, in the 

 Middle Lias, close to the watershed, and the second near 

 " Over Norton," in the Upper Lias. The course of the 

 Swere is due west, lying between two east and west 

 Faults, as far as Swereford. From this point the stream is 

 confined between the Great Rollwright and Swereford 



