6o PROCEEDINGS OF THE COTTESWOLD CLUB 



St Peter or Eastington. These springs rise from the 

 Fuller's Earth through the influence of the east and west 

 King's Mead, Preston, and Ampney Crucis Faults. 

 Occasionally they release their waters to the extent of 

 from 10 to 12,000,000 gallons per day; at the same time 

 after wet weather the Winterwell Spring is capable of 

 delivering 3,000,000 gallons per day to feed the Ampney 

 basin. Of the entire drainage area of 40 square miles, 

 about 28 occupy permeable strata, the remaining 10 or 12 

 being over or upon the Impermeable Oxford Clay. 



Basin of the Coln 



The Coin rises at Charlton Abbots close to the divide 

 issuing from a fault near the base of the Inferior Oohte, 

 in a group of springs a little south of Charlton Abbots, it 

 then flows over the Upper Lias, draining the sands of the 

 Inferior Oolite as far as Sevenhampton, Syreford, Ando- 

 versford and Shipton to Withington, all in the Upper 

 Lias Clay, it then immediately enters and drains the 

 Inferior Oolite as far as Foss Bridge and Coin St Dennis. 

 No less than nine east and west parallel Faults traverse- 

 the Lias and Oohte between Charlton Abbots and Stowell, 

 north of Coin St Dennis; these govern and greatly aff'ect 

 the water system of the Upper Coin, between or from the 

 water parting to Stowell. Between Stowell and Lechlade 

 the only known Fault of importance throws out the 

 copious spring of Bibury. From Bibury to the Thames 

 at Lechlade the Winterwell and Quenington Fauh much 

 influences the flow to Fairford. 



The water parting between the Basins of the Ampney 

 and Coin lies a little east of Winterwell, whose variable 

 spring largely feeds the Ampney and Marston streams. 



The Coin from Foss Bridge to Bibury flows over the 

 Fuller's Earth, which is here lost : the Great Oolite and 

 Forest Marble absorb all rainfall, but it is doubtful if any 



