276 
LOWER OOLITIC ROCKS OF ENGLAND: 
certain layers which are shown in the cutting by Hayley Farm, 
and which I have grouped with the Upper Division of the Great 
Oolite. (See p. 277.) 
The upper beds of the Great Oolite and the junction with the 
Forest Marble, were shown at Vaze's Quarry, in the valley north- 
west of Tetbury. The section was as follows : 
Forest 
Marble 
(Brad- 
fordian). 
Great 
Oolite 
(Kemble 
FT. IN. 
["Fissile and more or leas sandy oolite, 
I much false-bedded : the lower beds 
| used for planking - - 15 
t Grey clay - 1 to 3 
("Oolite in thick beds, shelly in places ; 
the bottom layer current-bedded, and 
resting 011 a fairly level surface of 
^ markedly false-bedded oolite beneath. 
I Beds used for walling - 10 to 12 
j Buff and white, false-bedded oolitic free- 
(_ stone : hard and soft beds - 10 to 12 
("White Limestone series, below; but 
not exposed.) 
Proceeding along the railway-cuttings north of the old Tetbury 
road station (G.W.R.), we find shallow sections of fissile and 
false -bedded shelly oolite, divided by a band of marly clay 6 to 8 
inches thick. These represent the upper (Kemble) beds of the 
Great Oolite, and cannot be far below the Bradford Clay. 
Further on by the 92nd milestone, lower beds are seen^ as 
follows 
o 
O 
r Bubbly and fissile oolite, with Ostrea 
Kemble (abundant), large specimens of Tere- 
Beds. I bratula maxillata, Lima cardiiformis, 
I and Corals ... 
Seam of clay. 
J False-bedded white oolite, with Corals 
\ (stone quarried) - - about 
FT. IN. 
10 
Kemble 
Beds. 
I 
White 
(_ Limestone 
< 
White 
$ {_ Limestone. "X (stone quarried) - - about 12 
At this locality, a little south of the Thames and Severn 
Canal, a fault is marked on the Geological Survey Map. North 
of the canal we find, on the east side of the railway, a quarry in 
fissile shelly oolite. 
In the south-eastern part of Hayley Wood there is a fine 
cutting on the Great Western Railway, which shows the following 
sequence : - 
FT. 
Marly bed (base of Forest Marble P) 1 to 2 
^Soft oolite, rubbly, and with marly 
layers ; and one or two bands of 
compact limestone, with irregular 
cavities like Dagham stone - - 4 
Hard creamy limestone ; pale matrix 
with brown oolitic grains 
Oolitic marly layer with Lamellibranchs 
Pale fine-grained and hard oolite with 
cavities in top part : Nerincea - 
Pale and brown oolite - 
Hard pale oolite, prominent layer 
Fissile and shelly oolite ; false-bedded 
shivery freestone - - 10 to 
White Lias " (I was informed) had been 
proved about 4 feet beneath the level 
of the railway. 
f 
3 
1 
4 
6 
1 
12 
IN. 

