PROCEEDINGS OF THE COTTESWOLD CLUB 73 



Neocomian or Lower Greensand, not exceeding 8 square 

 miles. Put in tabular form they are as follows : 



The Great Oolite and Forest Marble - 9^ sq. mis. 

 „ Cornbrash - - - - 21^ ,, 



„ Oxford Clay - - - - 75 

 „ Corallian Beds - - - - 4 „ 



„ Kimmeridge Clay - - - 3 » 



„ Portland Oolite and Sands - 5^ 

 „ Neocomian - - - - % ■,, 



114 



The Cornbrash crosses the basin of the Ray in two 

 parallel banks ; the western portion averaging three 

 miles in width, occupying the county between Kirtlington, 

 Bicester, and Stratton Audley, along the eastern escarp- 

 ment. Parallel to this unbroken range in the Oxford Clay 

 are the three conspicuous outlying masses of Cornbrash, 

 ranging from Islip to Marsh Gibbon, each having its small 

 village, viz. : Noke, Oddington, Merton, and Ambrosden : 

 and a smaller patch at West-stan Hill. 



These outhers and the eastern escarpment of the 

 Cornbrash have much influence upon the water system of 

 the Ray Basin ; no less than eight spring tributaries drain 

 the Cornbrash between Stratton Audley and Weston on 

 the Green, along its south-eastern escarpment, all passing 

 over the Oxford Clay. 



The Basin of the Ray yields a considerable but variable 

 supply of water from the flat plain of Ott Moor, being 

 situated on the wide spread of the Oxford Clay. This "Ott 

 Moor" forms an extensive lake, and becomes after heavy 

 rains a " flood regulator." 



The tributaries to the Ouse meet those of the Ray 

 close to the northern and western sides of the watershed. 



The Ouse drains more than one-hundred square 

 miles of Great Oolite north of the Cornbrash, which 



