190 
LOWER OOLITIC ROOKS OF ENGLAND : 
The limestone in the quarry is burnt for lime. One of the workmen 
dug down to the sandy beds at my request. In the same field, however, 
about 4 feet of yellow brown and white sand was exposed ; while at the 
adjacent ironworks, the section showed (on 
Fl G. 52. top) 3 feet of limestone-rubble, resting on 
nf (llp-ndnn vnrtJi 3 feet of white and yellow sand, and then 
at Wendon, north bpown gand . rockj ^. as rec orded. The 
j -Kettenng. thickness of the Lower Estuarine Beds is 
greater than that noted by Mr. Etheridge. 
Borings at Weekley and Weekley Hall 
Wood, proved from 15 to 18 feet of " sand," 
resting on from 14 to 22 feet of "rock," 
before clay was reached. This evidence 
tends to show that the "rock" (North- 
ampton Sand) is rather thick in this neigh- 
bourhood. (See Figs. 51 and 53, and p. 173.) 
At Geddington the thickness of the 
Lincolnshire Limestone is from 15 to 
20 feet. Many fossils have been ob- 
tained at Rushton, where at the base 
of the limestone there is a thin layer 
of sandy limestone (1 foot) that repre- 
sents the Collyweston Slate. 
Prof. Judd states that at Desborough 
the ironstones and overlying sands and 
clays were well exposed in a deep cut- 
ting near the railway-station, where 
they are covered by Boulder Clay; 
and also in the numerous large pits at 
which the iron-ore is very extensively 
12. Drift Soil. 
10, 11. Lincolnshire Limestone. 
2-9. Lower Estuarine Series. 
1. Northampton Sand. 
dug for the purpose of being sent away by rail into Stafford- 
shire, Derbyshire, and Yorkshire. Near this place we have an 
interesting example of the development of calcareous beds in 
the midst of the Northampton Sand. These calcareous beds 
form a band of hard, blue, ferruginous and very shelly lime- 
stone in the midst of the ironstone beds ; this ferrugino- 
calcareous rock is dug for road-metal. In the country to the 
southwards, however, the Northampton Sand often locally assumes 
calcareous characters, and passes, sometimes throughout the 
greater part of its thickness, into an impure limestone of oolitic 
structure.* 
Prof. Judd gives the following section of the strata exposed 
in a pit below Cottingham Church : 
n n,r 4- ai + / Light brown, sandy beds at the bottom 
Collyweston Slate ( ^ f the Linc ' olllgll f re Oo lite - 2 to 
f Dark bluish-black marl, full of plant- 
remains - - 
Marl of lighter bluish-black olour, 
Lower Estuarine J with plant-remains running through 
Beds. l it (" plant-bed ") 
Whitish and drab laminated sands 
Dark-blue clay - ... 
White sand .... 
FT. IN. 
3 
* Geol. Entlaud, pp. 94, 95. 
