358 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [ Mar. 9, 
Thus there are four several areas within a comparatively small 
space (Fig. 1) in which the whole series of beds occurring in each, 
from the Great Oolite (including the same) down to the Upper 
Lias, are accessible ; and these severally I propose to describe. 
They are situated at or about :—1. Kingsthorpe ; 2. Northamp- 
ton; 3. Duston; 4. Blisworth. The individual beds of these 
several localities vary considerably ; but collectively they may be 
said to present the following General Section, in which I have given 
maximum thicknesses in feet, and which, indeed, may be accepted 
as the typical section of a large portion of the county of North- 
ampton :— 
General Section of Oolitic Beds in the Northampton District. 
feet. 
_ (X Stratified and variegated Clay at Blisworth, containing abundant 
& Ostred subnuguUlos@ vrs asec. scceaendeecngetc ean cues sete soe eeere cae ees aa 2 
‘a | A White Limestone, disposed in beds of from a few inches to about 
2) three feet in thickness, much fissured, varying in character, and 
3 containing characteristic Great-Oolite fossils ................:s.eee0e0e 25 
= | B Blue and Grey Clay, dug for brick-making, with ferruginous band 
© at base, and Great-Oolite fossils ........0:..cecsececcecseeesecseeeseeeens 15 
( 
XX_ [Line of unconformity] 
( C White or Grey Sand, more or less coherent, and with occasional 
ferruginous stains—sometimes quarried for building stone. A 
| plant-bed is usually found in this sand..................s2ceeeeeeeeee seers 12 
D A series of very variable beds, composed sometimes of ferruginous 
3 | sandstone in thin layers, which overlie calcareous beds containing 
| shelly zones, false bedding being frequent : sometimes the whole sec- 
tion consists of calcareous rock with false bedding ; sometimes it 
4 presents a series of beds of compact ferruginous sandstone, with no 
| fossils. In one instance, the entire section consists of white sand 
| and sandstone, with no fossils ..........scscccsccessecsecsecceetseceecseees 30 
Coarse Oolitic or subcrystalline Limestone, with fossils, overlying a 
calcareo-arenaceous slate, like Collyweston slate .................:0..068 4 
| E Beds, chiefly consisting of Ironstone, containing Rhynchonella varia- 
{  btlis, and RB. cynocephala, and Ammonites bifrons at the base ......... 35 
Upper Lias Clay. 
Northampton Sand, 
Inferior Oolite 
I have provisionally distinguished the beds of D and E in this 
section, because I think I have evidence in the Northampton and 
Duston areas and elsewhere to justify me in so doing; the particu- 
lars of this I will give in my description of the beds of those 
areas. I admit, however, that the beds of EK may be simply the 
lowest beds of D under another and local phase of conditions ; but in 
this case a considerable addition must be made to the thickness 
of D. 
Lists of Fossils from the several localities are given in Tables at 
the end of the Memoir. 
