PROCEEDINGS OF THE COTTESWOLD CLUB lOI 



The 4 Rivers, the Upper Thames, Churn, 



Ampney, and Coin on the north side 



of the Thames above Lechlade and St 



John's Weir drain 8 geological hori- 

 zons to the extent of - - - 291^ sq. miles 

 The 14 Rivers on the north side of the 



Thames between Lechlade and Oxford 



drain 13 geological horizons to the 



extent of ----- cjyy^ sq. miles 



The 6 Rivers on the south side of the 



Thames above Lechlade, and in the 



Swindon Basin, drain 8 geological 



horizons to the extent of only - - 174^ sq. miles 



1444 



The 3 Rivers (Ray, Cole, and area between the Cole and 

 Ock), and areas between them in the Swindon Basin 

 drain 4 divisions of the Cretaceous Rocks to the extent of 

 27^ sq. miles. 



Table No. II shews the geographical distribution of the 

 Jurassic Rocks of the Cotteswolds, showing the individual 

 and united thickness of the 10 horizons or divisions of 

 the Oolitic Series. It is not given as or intended to be 

 complete, but as far as the individual thicknesses go they 

 may be depended upon : omissions may be supplied by those 

 who know the Cotteswold Rocks and their local strati- 

 graphical history. The right hand column gives the 

 thickness of the strata on their dip, mainly from west to 

 east. 



Table No. Ill shews the distribution of the permeable 

 and impermeable strata of the Upper Thames Watershed* 



