PROCEEDINGS OF THE COTTESWOLD CLUB 57 



small feeder from Ullen Farm and Wood, joining the Churn 

 at Cubberlcy. The Shurdington and Yanworth Fault 

 passes the Seven Springs a little south of them, and is 

 undoubtedly the cause of their issue, which at times 

 is very considerable. 



From Cubberley the Churn traverses the Upper Lias 

 Clay and Sands to Colesbourn and Rendcomb. The 

 Cubberley and Postcombe Fault, at Upper Cubberley and 

 north of Colesbourn where the two tributaries meet, 

 largely contributes to the variable, and at times large 

 quantity of water passing down the Coin to North Cerney, 

 Baunton, and Siddington, here much influenced by the 

 system of rectangular faults between the Forest Marble 

 and Cornbrash. The Siddington and Ampney Crucis 

 Faults on the north, and the Boxwell Fault to the south, 

 fully accounts for the fine springs that issue from or 

 between the Forest Marble and Cornbrash Fault at 

 Boxwell, at times to the extent of 2,000,000 gallons per 

 day. 



The springs in the Churn Basin below North Cerney 

 are sometimes lost from the river, but reappear below 

 South Cerney, or Cerney Wick, after receiving the artesian 

 Boxwell supply from the Fault. The numerous springs 

 lost from the upper part of the Churn in traversing the 

 Inferior Oolite between Colesbourn and North Cerney, a 

 distance of 4 miles, is known to amount occasionallv to 

 267 cubic feet per minute, or at the rate of 2,403,000 

 gallons per day. 



These subterranean waters are retained /ro tern between 

 the impervious clays of the Upper Lias and the overlying 

 Inferior Oolite, the former throwing out the absorbed or 

 percolated waters as springs — and where the Fuller's 

 Earth Clays occur they retain and release all rain water 

 received through the Great Oolite and Forest Marble 

 above. 



