ON THE CIRCULATION OF UNDERGROUND WATERS. 



285 



Section of Well at E. T. Lydden's, Esq., Llanishen, near Cardiff. 

 Collected by the Cardiff Naturalists' Societj'. 



Pit through clay and stones 



Clay and stones 



Ballast . 



Running sand 



Ballast . 



Red gravel 



Sand 



Red gravel (Upper Old Red Sand 



stone) 

 Red marl 

 Red rock 



Conglomerate rock 

 Red rock 



Conglomerate rock 

 Red rock 

 Stiff red marl 



Feet 



11 

 1 



Inches 



Lined to 40 feet with 4-inch tube from surface. Water level, 23 feet 

 from surface. Supply pumped down in five minutes with 4-inch pump, 

 but rises again directly. Water first touched at 47 feet from surface. 



Section of Well, Ely Brewery Company, Limited, Ely, near Cardiff. 

 Collected by the Cardiff Naturalists' Society. 



25 ft. 8^.in. tube, 4 ft. 6 in. below surface. 

 125 ft. 7:^-"^- ^"b®' ^ ^*- l^elow surface. 



Supply, 72 gallons in 74 seconds. Level of water, 7 feet from surface. 

 Water first touched in rock about 125 feet from surface. 



