1870. } SHARP—NORTHAMPTONSHIRE OOLITES. 365 
Fig. 3.—Section of double Fault in Lee 
TWMOULIACE-BOUy Mammen Hee locas Ae ean acy es onuised calmer cseseeteavericesns 1) 
6. Limestone in thin broken layers, sometimes full of shells, chiefly | 
Ostrea, and crystalline from the presence of carbonate of lime, having 4 A 
an irregular incline to the §.E.; at the bottom a softer zone, con- 
taining Ostrea Sowerbyi and large Rhynchonella concinna.........-+ 3| 
ce. Soft cream-coloured sand and clay-bed, full of Ostrea Sowerby? ...... 2 
d, Blue clay, with ferruginous band (€) .........00.seeceeneceecnsceen eee 2to 3 B 
f. White and grey sand with an admixture of clay, stratified, and ferru- 
TMOUY mn OES) Gaoabacde |neosedao sdecHonouosenousboueccsedraacnooaded upto 8 C 
The presence here of the lower zone of limestone with Rhynchonella 
concinna and Ostrea Sowerbyi, and the blue clay with a well-marked 
ferruginous band at base, irregularly overlying the white and grey 
sand, completely identify this section with that at Kingsthorpe, 
notwithstanding that the blue clay (B) has thinned down from 14 
feet to 3 feet. 
About half a mile to the N.E. of this section, on the Kettering 
road, and close to the stand of the race-course, is a large pit (x), 
quarried for clay, sand, and building-stone. At the top of this 
section appears a cream-coloured clay, which I think may possibly 
be of Drift origin, and composed of the material of the denuded lime- 
stone. I am induced to suggest this by the fact of the very irregular 
surface (attributable to erosion) of the Blue Clay beneath (B); which 
varies in thickness from 1 to 3 feet, and appears somewhat disturbed 
in places. The ferruginous band, which elsewhere characteristically 
bases this clay, is observable also in this section. 
The Sand (C) is here of the full thickness of 12 feet. It is much 
stratified and variegated in places, and upon the whole it is more 
ferruginous than I have found it in other sections. Some beds are 
hardened nearly into stone. The plant-bed occurs several feet above 
the bottom of the sand. 
Beneath this sand, separated by a well-defined line, is a ferru- 
ginous sandstone, about 12 feet in thickness, disposed in five beds, 
the lower one of which is more ferruginous than those above it. 
These are upper beds of the series D; and, as in the case of the fer- 
ruginous sandstone basing the section of the sand-pit (f) at Kings- 
thorpe, they yield no fossils. I obtained, however, from this pit a 
ripple-marked slab of the ferruginous sandstone, upon the upper 
face of which is a film of the white sand. Evidently it is a frag- 
ment of the surface-material of the upper bed of this sandstone, and 
indicates a littoral or an estuarine condition of the area at the period 
represented by this junction. 
About a quarter of a mile N. of this point is Mr. Bass’s pit (2). 
The lower part of the last is represented, I think, in the upper beds 
of this section. The pit is excavated quite through the ferruginous 
beds, down to the Upper Lias. 
