100 PROCEEDINGS OF THE COTTESWOLD CLUB 



These i8 streams drain l6 divisions of the Jurassic 

 Rocks, and 4 divisions of the Cretaceous. 



Each of the rivers shows the drainage of the groups of 

 strata in square miles, and it is expressed by the horizontal 

 lines of figures, their totals being given on the right 

 hand. 



The totals of the drainage of the stratigraphical rocks 

 are given in square miles at the foot of the table, thus each 

 river and each division of the periods represent both the 

 river and stratigraphical drainage in square miles. For 

 example: the Windrush drains 147^ square miles of 

 area from 10 of the Jurassic Rocks ; and the Great Oolite 

 is drained to the extent of 256^ square miles by 10 of 

 the rivers. The totals of all are given both ways. 



sq. miles 



The Lias is drained bv 6 rivers to the extent of 230)^ 

 ,, Lower Oolites ., 12 ., „ ,. 559^ 



„ Middle „ „ 20 ., „ ., 492^ 



„ Upper „ „ 8 „ ,. „ 159^ 



1443 



The Cretaceous Rocks by 3 Rivers,* (the Ray, Cole, and 

 area between the Cole and Ock) 27 ^/^ sq. miles. 



* I cannot include the Ock and Thame in the true Cotteswold are.i although in the 

 Upper Thames division. The Ock is below or south of the Thames, and enters the 

 River at Abingdon, after draining 57^ square miles of Jurassic Rocks and 38 square 

 miles of Cretaceous. The Thame lies to the east of and enters the main river above 

 Bensington Weir (Wallingford), and drains 11 geological horizons to the extent of 

 2651^ square miles, 157^^ of which are Cretaceous — and as before stated both feed the 

 Thames above the Great Bensington Weir, which separates the waters derived from the 

 Jurassic Rocks from those of the Cretaceous or Middle Thames Basin — the total drainage 

 of the Cretaceous Rocks given in the table is 224 square miles. 



