408 
LOWER OOLITIC KOCKS OF ENGLAND : 
FIG. 113. 
Section of the strata 
south of Thrapston. 
Cornbrash. 
G-reat Oolite 
Clay. 
9 K 
_'V "~ 
7"*"* ir " 
h \ 
f. i'-- 
F 
FT. IN. 
Soil, with Drift pebbles - 1 
11. Bubbly limestone and marl, 
with Goniomya, Isocar- 
dia, Myacites, Ostrea, 
Pholadomya, Waldheimia 
lagenalis, W. obovata, 
Terebratula intermedia (at 
base), Serpula, &c. - 3 
10. Brown shelly clay with 
"race," passing down 
into dark blue clay, and 
thence into greenish-grey 
carbonaceous clay, dark 
shaly clay, and greenish- 
yellow and blue clay - 12 
9. Calcareous gritty rock and 
clay, with Ostrea - - 1 
8. Yellow marly limestone, 
with fragments of Ostrea: 
layer of Ostrea Sowerbyl 
at base - - - 1 
7. Marly and occasionally 
oolitic limestones (3 
layers), with Ostrea, Mo- 
diola, &c. : parted by 
thin bands of selenite (as 
at Newport Pagnell) - 2 7 
Great Oolite j 6. Soft brown rock made up 
Limestone, j of comminuted shells and 
oolite grains - - 10 
5. Hard and soft marly, shelly, 
and oolitic limestones - 5 
4. Brown shaly clay, with 
Ostrea - - - 1 5 
3. Brown and yellow (blue- 
hearted) marly limestone^ 
with shell-fragments and 
unbroken Mollusca - 5 
2. Blue and brown shelly clay 5 
1. Grey earthy marl and lime- 
stone - - 1 4 
The beds undulate a little, and the upper portions of the Great 
Oolite Clay and Cornbrash are nipped up here and there, as if by 
Glacial action, like the Lower Lias strata noted in the Memoir on 
the Lias (p. 146). The limestone is quarried for use in the furnaces 
at the Ironworks. 
Prof. Judd has stated that in the Tichmarsh cutting of the 
Northampton and Peterborough Railway, the base of the Upper 
Estuarine Series, consisting of a mass of clays about 5 or 6 feet 
thick, is seen resting directly upon the sandy, and here non- 
ferruginous, beds of the Northampton Sand. South of the village 
of Wadenhoe, there was a pit in which he noted the following 
section : 
