INFEEIOR OOLITE: WALTHAM-ON-THE-WOLDS. 207 
The general section of the beds, as noted by Prof. Judd, near 
Edith Weston, Whitwell, and Exton is as follows : 
y. , ,. I" Oolitic limestone. 
1 White siliceous limestone with mammillated sur- 
[ faces (equivalent of Collyweston Slate) . 
Lower Estuarine / "White and fawn coloured sands. 
Series. \ Light blue clays. 
Sand 1 I 1 " 0118 * 10116 beds - - - 10 to 12 feet. 
Upper Lias Clay. 
Prof. Judd states that from Burley, for some distance north- 
wards, the Lincolnshire Limestone does not reach the edge of the 
escarpment, the Northampton Sand forming a tract, about a 
mile wide, at the top of the ridge on which stand the villages of 
Cottesmore and Market Overton. The junction of the Limestone 
and Sand in this 'part of the district is often greatly obscured by 
Drift ; the boundary between the latter and the subjacent Upper 
Lias Clay is, however, very distinct and easily traceable until we 
get to Wymondham, where the great Boulder Clay sheet over- 
laps the edge of the escarpment on to the Lias plateau below. In 
the neighbourhood of Cottesmore, Barrow, and Market Overton, 
numerous small sections of the ironstone-rock and of the over- 
lying Estuarine sands and clays can be seen, but they afford 
only a repetition of the characters noted, at many points to the 
south. The greatest thickness of ironstone is 9 feet, and much 
of it is oolitic. The escarpment along this line, from Burley-on- 
the-Mll to Market Overton, is nearly as bold and striking in 
appearance as that between Buckingham and Harringworth.* 
Waltham-on-the-Wolds, Great Ponton, Ancaster, and Sleaford. 
At Waltham-on-the-Wolds the general succession of the beds 
has been summarized by Mr. A. J t Jukes-BroAvne, as follows : 
FT. IN. 
Lincolnshire j politic limestones, &c. - - 20 to 30 
-Limestone. J 
}Shaly sandstone' - 1 
Lower Estuarine ? Soft yellow sand - - -30 
Series. \ Bluish-grey laminated clays - about 13 
C Ironstone (best red stone) - 3 
Northampton J Ironstone ("curly") a mass of fossil 
Sand. I casts^ - - - - 3 
I Ferruginous " sandstone" - - 5 
Here the Ironstone beds were at one time extensively worked ; but the 
ore is not of good quality, analyses showing an average amount of 20 per 
cent, of iron, with 50 per cent, of silica. The workings were discontinued 
in 1885.t 
The shaly sandstone on top of the Lower Estuarine Series may 
be taken as a representative of (he Collyweston Slate. The largo 
* Geology of Rutland, p. 97 ; and Kendall, Iron Ores of Great Britain, 1893,. 
p. 239. 
f Geol. S.W. Lincolnshire, p. 47. 
