40 PROCEEDINGS COTTESWOLD CLUB 1907 
bed I, for in the middle of the east face of the quarry, clay 
is introduced in a trough-like hollow. 
The well at the new schools at Leighterton proved 
Great-Oolite limestone to a depth of 21 feet 6 inches. The 
few intercalated thin bands of arenaceous clay frequently 
much interfered with the blasting, as the explosion often 
resulted merely in the blowing out of the soft material 
composing the layers. It seems probable that the maximum 
thickness of the Great Oolite in the neighbourhood of 
Leighterton is not far short of 125 feet. Below the Great 
Oolite is the Fullers’ Earth—an argillaceous deposit. 
Therefore, to obtain anything like a satisfactory supply of 
water by means of a well outside the clay-area would entail 
sinking to a depth of close upon 125 feet. This view is 
supported by the fact that a well situated by the roadside, 
immediately west of the Rectory, and 96 feet deep, yielded 
but little water. It is most unfortunate for the village that 
this well was ever sunk, for it has pierced the water- 
upholding Forest-Marble clays. 
