DE RANGE : UNDERGROUND WATERS IN LINCOLNSHIRE. 31 
Marly, Rubbly Limestone 
Hard Clay and Stony Marl 
Ditto 
Marl 
Clay 
Marl 
Ft. In. 
5 9 
4 10 
0 11 
0 3 
0 6 
0 7 
12 10 
Or about 13 feet in all, leaving 52 feet of porous material, of 
which half may be considered as permanently saturated with water, 
or 26 feet. Taking the width of outcrop between Coleby and Dunston 
at five miles, a pumping station placed beside the railway south of 
Dunston Station, draining the rock half-a-mile north and south 
respectively, might be expected to produce, in dry years, the daily 
quantity of 700,000 gallons of water. 
The best site for a boring to obtain the waters in the Lincoln- 
shire Limestone north of the city is Scothern. and after that Dun- 
holme. In either case the boring should commence in the Oxford 
Clay, so as to have the cover of an impermeable material. Such 
borings would be of an artesian character. This has been proved on 
the west side of the village of Dunholme by a boring 106 feet deep, 
the water rising five feet above the surface, in a pipe H inches in 
diameter, with a discharge of 20,000 gallons in 24 hours. This boring 
must penetrate the 
Cornbrash ... ... ... ... ... 5 ? 
Great Oolite Clay ... ... ... ... 25? 
Great Oolite Limestone ... ... ... ... 15? 
Estuarine Beds ... ... ... ... ... 35 ? 
Lincolnshire Limestone ... ... ... ... 26? 
The occasional presence of " swallow-holes " in the Lincolnshire 
Limestone, into which the streams are precipitated, the cracks and 
fissures that seem to accompany the outburst of springs, all tend 
to show that this rock is capable of holding a very large quantity 
