230 PROCEEDINGS OE THE GEOLOGICAL SOCIETY. [Feb. 5, 



ampton Section, there separate the Great Oolite Limestone from 

 those lower beds. 



About three miles to the south of the Harrington area, and half 

 a mile due east of the village of Old, is a .small narrow strip of the 

 Lincolnshire Limestone, only worthy of mention as being the most 

 southerly point at which the presence of that Limestone has been 

 detected. 



Kettering. 



At about a mile due east of Kettering, the eastern escarpment of 

 the valley of the small river Ise presents this section : — 



Great Oolite Limestone. 



Upper Estuarine Series. 



Lower Estuarine Series, 1, T ,, , r, ■. 



Ferruginous Beds, ] Northampton Sand. 



Upper Lias Clay. 



This sequence (with the occasional superaddition of the Great 

 Oolite Clay) is continued due east, right across the county to the 

 Nene valley (a distance of 6 miles), and, with the further super- 

 additions successively of Cornbrash, Kelloway Rock, and Oxford 

 Clay, some three miles further still, to the boundary of Northampton- 

 shire, and so on beyond, into Huntingdonshire. 



Upon the outcrop of the same escarpment, at a point near Ket- 

 tering Mill, and a very little north of the last-mentioned section, 

 we find, as it were, the thin end of the wedge of the Lincolnshire 

 Limestone coming in; and this section, and for the first time, is 

 presented : — 



Great Oolite Limestone. 



Upper Estuarine Series. 



LINCOLNSHIRE LIMESTONE (very thin). 



Lower Estuarine Series, ] -v , , Q 1 



-c • -p. j ' }■ Northampton Sand. 



. Ferruginous Beds, J L 



Upper Lias Clay. 



Upon the summit of the escarpment, upon the opposite or 

 western side of the Ise valley (which here is about three quarters 

 of a mile wide), and at about three quarters of a mile north-east 

 of Kettering, the Lincolnshire Limestone, with a slightly increased 

 thickness, again occurs, and at a little distance to the north is sur- 

 mounted by the Upper Estuarine beds. 



It is clear that at this point we cannot be very far off the original 

 line of the thinning out of the Lincolnshire Limestone, and that we 

 have touched upon the main continent (so to speak) of that forma- 

 tion, from which the Ise valley has here severed a portion of the 

 southern margin ; for, as the valley of the Ise trends northwards, 

 the thin band exposed by the escarpment both thickens and spreads. 



Leicestershire . 



From the point of its first appearance near Kettering, the forma- 

 tion extends for six miles in a north-westerly direction towards 

 Leicestershire ; in which county is a small outlier between Med- 

 bourne and Holt. 



