INFERIOR OOLITE : NORTHAMPTON. 181 
FT. IN. 
Ironstone - - -"] 
Sandy Bed - - - - | 
Bedded ironstone, oolitic in places ; J> ' 
"Northamt>t( L vritln. Astarte, Lima, Naiitihis,GaBtero- 
Beds. 
- \ 
pods- - - - J 10 
Green and brown ironstone - "1 
Concretionary ironstone, with > 1 to 2 
occasional small nodules - J 
JEarthy and sandy ironstone - -10 
rOlay - - - 1 
TT T . J Grey and brown clay with thin bands 
'] of ironstone. 
I Blue clay. 
The pits at this locality show from 10 to 12 feet of ironstone 
and sandy beds, some of them oolitic, and all fairly well bedded. 
Not more than 10 feet of brown ironstone is worked, the lower 
beds for about 2 feet are usually rejected, although here and 
there good ironstone occurs down to the bottom of the beds. 
These include certain green beds, which are tinted by silicate of 
iron arid are more or less phosphatic. The oxidation of the beds 
has been irregular, and green-tinted ironstone is found in 
patches at higher levels. The ironstone rests on the blue clay of 
the Upper Lias, consequently the pits are usually wet at the 
base. 
Many fossils may be obtained, and these occur sometimes in 
particular layers, so that there is locally an Astartc-bed with A. 
elegant. Among other fossils are Ammonites insignis, Nautilus 
multiseptatus, Cardium, Ceromya bajociana, Cucullaa, Lima, 
Pecten, Trigonia, Terebratula maxillata, T. trilineata, &c. 
When the ironstone has been worked out the ground is partially 
filled up and levelled with the waste material. This was the case 
with the Danes Camp at Hunsbury Hill, the centre of which has 
been excavated for iron-ore and levelled. Near Duston there are 
several picturesque old quarries both in the ironstone and 
building-stone : the excavations varying in depth from 25 to 35 
feet. 
Northwards of the Duston ironstone-pits, the beds undergo a 
considerable change, similar indeed to that of the Middle Lias 
between Kings Sutton and Hornton. Thus the Northampton iron- 
ore of Duston (in a much shorter distance) passes into a useful 
building-stone. 
The section at the New Duston Stone-pit, which 1 visited in 
company with Mr. B. Thompson, was as follows : 
FT. IK. FT. Ix. 
'White sands, &c. O 3 to 4 
Sandy clay - - - j 
Dark grey carbonaceous clay - 1 6 to 2 
Yellow clayey sand with root- 
lets - - - - 6 to 1 6 
Ochreous yellow sandstone 
(Eoylands, &o. - 10 to 12 
