360 
LO\pJK OOLITIC ROCKS OF ENGLAND : 
fossils indicate the presence of the Bradford Clay. A large 
amount of saline water was encountered in this sinking.* (See 
p. 515.) 
In 1882 a deep boring was commenced at Richmond, and this 
was carried to a depth of 1,409 feet in 1884. At the depth of 
1,151 ft. 6 in. a bed of hard oolitic limestone was proved, and 
thence to a further depth of 87 ft. 6 in., beds belonging to the 
Great Oolite Series were penetrated. 
These beds rested on variegated marls and sandstones probably 
of Old Red Sandstone or Devonian age (though grouped by some 
with the New Red Sandstone) ; and they were overlaid by 
Cretaceous deposits, the basement-beds of which contained some 
materials derived from the underlying beds of Great Oolite. 
The details of the Great Oolite Series have been recorded by 
Prof. Judd and Collett Homersham as followsf : 
[Forest Marble 
and 
Bradford Clay .] 
[Great Oolite.] 
Dark oolitic limestone - 
Pale marly limestones with scattered 
oolite grains, and many Foramini- 
fera ..... 
Dark oolitic limestones - 
Shelly limestone with fewer oolite 
grains, and many Foraminifera 
Compact limestone with scattered oolite 
grains, fragments of shells, &c. 
Blue clay with bands of limestone and 
many fossils ... 
Oolitic and shelly limestone 
Band of fuller's earth - 
Fine-grained oolitic limestone with 
much pyrites, becoming sandy lower 
down ; and at its base a fissile cal- 
careous and micaceous sandstone re- 
sembling Stonesfield Slate ; Acrosa- 
lenia, and other fossils 
Oolitic limestones with many frag- 
mentary shells, Ostrea Sowerbyi, &c. - 
Limestone with fragments of shells, a 
few grains of quartz and particles of 
anthracite .... 
FT. 
5 
22 
10 
IN. 

11 
8 
17 

6 
87 6 
The age of these beds was recognized by Prof. Judd, who has 
given a full list of the fossils : many of these were obtained from 
the blue clay, which perhaps represents the Bradford Clay at the 
base of the Forest Marble. I have ventured to group the strata 
in accordance with this view. Among the fossils recorded are 
O 
Terebratula coarctata, T. maxillata, Cidaris bradfordensis, 
numerous Polyzoa, &c. 
In his account of an Artesian Well-boring made at Messrs. 
Meux and Co.'s brewery in the Tottenham Court Road, London, 
* Quart. Journ. Geol. Soc., vol. xlii. pp. 293, 298. 
t Ibid., Tol. xl. pp. 7 41, &c. 
