VOL. XIX. (r) DEEP BORING— TETBURY WATERWORKS 
57 
A DEEP BORING AT THE WATERWORKS. 
TETBURY, GLOUCESTERSHIRE. 
BY 
L. RICHARDSON, F.R.S.E., P.G.S. 
[Plate IV.] 
In 1915 a deep boring was made by the Tetbury Urban 
District Council at their Waterworks at Tetbury. The precise 
site is three-quarters of a mile north by west of Tetbury Church. 
Boring operations commenced on June 7th and ended on 
December 17th. To be exact, a shaft was sunk to a depth of 
9 feet 6 inches, then a rotary boring made (i) with an 18-inch 
crown down to 153 feet, and (2) with a 13-inch crown down to 
446 feet — a total depth from the surface of 446 feet. 
At the existing Waterworks is a brick-lined circular well 
9 ft. 10 ins. deep and 6 ft. 9 ins. in diameter, from the bottom 
of which is a 7-inch bore-hole 290 ft. 2 ins. deep — total 300 ft. 
The top of the Inferior Oolite was reached at 252 ft. down, the 
same depth at which it was reached in the new bore-hole. The 
old bore-hole, therefore leaves off 48 ft. down in the Inferior 
Oolite ; the new one 55 ft. down in the Cotteswold Sands. 
The new bore-hole passed through 
21 ft. 3 ins. of Forest Marble beds 
103 ft. 9 ins. of Great Oolite (Kemble Beds, 31 ft. 9 ins. ; 
Great Oolite proper, 72 ft.) 
47 ft. 6 ins. of beds best described as “ Passage Beds ” 
79 ft. 6 ins. of Fullers’ Earth 
135 ft. of Inferior Oolite 
4 ft. of Cephalopoda-Bed 
and penetrated 55 ft. of Upper-Lias or Cotteswold Sands. 
