VOI.. XIX. (i) DHEP BOKING--TETBURY WATERWORKS 
63 
At 156 ft. 9 ins. a 13-inch crown was substituted for the 
18-inch one, and from between that depth and 162 ft. a nice 
core of rock (bed 27) — similar to that of the upper part of 
bed 26 — was drawn. Then came a gap in the core, where 
— according to the foreman — a 3 ft. bed of “ Fullers' Earth ” 
(27a) occurred. The next bed (28), which commenced (i ft.) 
as somewhat dark impure limestone, soon passed into rock 
similar to that composing bed 27, but it was more oolitic 
(coarsely so) and shelly — the shells, however, being only frag- 
ments. At Shipton Moyne, bed 51, between 8 ft. 4 ins. and 
2 ft. 4 ins. from the bottom of the “ Passage Beds,” was also 
coarsely oolitic. 
Fullers’ Earth. — At 172 ft. 6 ins. down came a change, 
and dark shaly marls (29) initiated beds crowded at various 
horizons with specimens of Ostrca acuminata J. Sow. The three 
bands of Os/rcn-Limestone (31, 36 and 40) were very noticeable. 
Beds 41 to 43 are comparable with the lower portion of bed 5 
at Kemble. 
The deposits grouped as Fullers’ Earth at Tetbury are 
79 ft. 6 ins. thick, as against 73 ft. at Kemble. 
Inferior Oolite. — The Inferior-Oolite beds, viewed as a 
whole in the core, were of a bluish-grey colour, except (i) the 
greater part of the White Oolite, (2) the top i ft. 2 ins. of the 
Lower Freestone, and (3) the top portion of the Lower Lime- 
stone, which were of a lighter grey colour — more yellowish- 
grey. 
The top portion of the Rubbly Beds was more rubbly 
than the lower, the beds were not typical as at Kemble, and 
not well separated from the White Oolite. 
The White Oolite was not so typical as at Kemble, but 
while the large oolite-granules so characteristic of the Clypeus- 
Grit occurred in it in places, the oolitic structure one ordinarily 
associates with an Inferior-Oolite freestone predominated. 
The White Oolite appeared to be less regularly-bedded here 
than usual, and irregular lumps of limestone and indurated 
shale separated the more massive oolitic rock. 
The Clypeus-Gni and Upper Trigonia-Gv\i — except in the 
matter of their colour — were quite typical, but there was no 
Upper Coral-Bed or representative of the Dundry Freestone 
