362 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [ Mar. 9, 
observable on the roadside at d, whence a spring flows, except 
during drought: springs occur at other points of the same junction ; 
and a stream dividing Kingsthorpe and Northampton takes its rise 
from the same. 
I have not obtained fossils from this Clay at Kingsthorpe, except 
at the point of junction, although frequently in other localities 
Ostrea Sowerbyi and some other Great Oolite fossils abound in it. 
Until recently, it was worked for brick-making at ¢, near Buttock’s 
Booth. 
- Its base is marked by a ferruginous band of from a few inches to 
a foot in thickness, observable at its junction with the underlying 
sand ata pit immediately north of Kingsthorpe, on the Brixworth 
road, marked f, and at other places. 
The pit last mentioned (f) is at the base of the hill between 
Kingsthorpe and the limestone quarries, and exposes a section of 
about 12 feet of a white or grey sand, C, the Upper Division of the 
Northampton Sand*, The line of junction with the clay above is 
irregular, affording evidence of an eroded surface, and marking an 
unconformable division between the Great and the Inferior Oolite— 
a division observable over a considerable area, and in perfect accord- 
ance with a certain important fact, to which I shall hereafter 
allude. 
This Sand is stratified, exhibits in places ferruginous stains, and 
is occasionally varied by the occurrence of argillaceous bands and 
patches. It is more or less coherent, and sometimes so indurated as 
to make a very durable building-stone, formerly much quarried, 
many public and other buildings in Northampton having been con- 
structed of it during the last century. 
It yields no fossils; but near its base is a plant-bed: a band, 
from 6 inches to a foot in thickness, made up of thin horizontal 
layers of sand separated by dark laminze (which, when first split, 
present a surface indented apparently with leaf- and stalk-markings, 
filled with vegetable matter), overlies a bed in which are what 
appear to be numerous vertical root-perforations, penetrating to a 
depth of from one foot to two feet. 
Beneath the plant-bed is a somewhat ferruginous bed of dark 
brown sandstone, apparently unfossiliferous. This is the upper bed ~ 
of the very variable series which I have grouped under D, as the 
Middle Dwision of the Northampton Sand. 
A characteristic section of this series of beds may be seen in the 
Nursery or “Shittlewell” pit (g), a few hundred yards south of 
Kingsthorpe. 
Section of the Nursery or Shatilewell Pit. 
ft. in, 
1. Very ferruginous Sandstone, in thin layers, sometimes shivered 
oft. to 4 0 
2. Ferruginous Sand, sometimes indurated into stone ...........-..20:-.+- 2 6 
* For the division of the Northampton Sand into Upper, Middle, and Lower, 
see Diagram of General Section (p. 380). 
