402 
LOWER OOLITIC ROCKS OF ENGLAND : 
These beds seem to be continued in the Lime-kiln quarry at Bunker's 
Hill, where, beneath a foot of marl and rubble, we find the following 
series : 
Great Oolite 
Limestone. 
Pale flaggy oolitic limestone - 
Fossil-bed : oolitic and shelly lime- 
stone, with Ostrea, Modiola, and 
Echinoderms - 
Grey earthy and oolitic limestones, 
large Pholadomya 
Brown clay, with ' race " and Ostrea - 
Fossil-bed : shelly and oolitic marly 
bed, more or less oolitic, with 
Echinoderms - 
Pale (blue-hearted) earthy limestone, 
with Modiola, Ostrea, Rliynchonella, 
spines of Echini 
Blue clay resting on hard pale marl 
Hard blue-hearted calcareous sand- 
stone (like beds at Olney). 
FT. IN. 
2 
2 2 
4 
In an adjoining brickyard, N.W. of Dallington, still lower beds were 
exposed, and between them and those above there may be an interval of 
20 feet. 
FT. IN. 
"Brown and grey clay (with stony soil) 2 
Pale grey clay with " race," and a 
band of dark ferruginous clay. This 
clay is too calcareous for brick- 
making - - - 7 
Ferruginous shelly layer 2 
Shaly and marly clay, with Ostrea - 1 6 
Hard stone almost made up of shell- 
Upper fragments, Ostrea, &c.; with pale 
Estuarine s marly seams in places, and much 
Series. jointed - .-40 
Brown clayey sand, with Ostrea 
Bluish-grey shelly clay - 8 
Purplish and grey clay with carbona- 
ceous matter and ochreous bands 
and veins thickening from east to 
west. This clay is used for the 
manufacture of red bricks, tiles, and 
drain-pipes - 8 to 12 
The lowest bed of t clay is said to become sandy at the base and to rest 
on " rough stone," probably indurated sand. Still lower beds of loam 
resting on sand, were proved to a depth of 12 feet in an adjoining field : 
they may belong to the Lower Estuarine Series ; arid beneath comes the 
Duston Stone (Northampton Sand). 
A well by the Lime-kiln quarry was sunk to a depth of 119 feet, and 
water was obtained from the stone-beds of the Northampton Sand.* 
The sequence of the beds at Duston Lodge and those at the 
Lime-kiln, is corroborated by the following seciion at Wooton Hall, 
south of Northamptonf : 
FT. IN. 
C Brown clay (piped). 
Base of Great I Rubbly marl and oolitic limestone, 
Oolite Clay. with Lima cardiiformis, Terebratula 
L maxillata, Waldheimia digona, &c. 5 
* See also Sharp, Quart. Journ. Geol. Soc., vol. xxvi. p. 369. 
| See also Proc. Geol. Assoc., vol. xii. p. 177. 
