GREAT OOLITE SERIES: KETTON. 413 
of the survey of the district, were being cleared and laid out in 
farms in this old forest tract. The same beds were passed through 
in a well at Cross Leas in the same district." The Great Oolite 
Clays have been worked for brick-making. 
" About Elton there are several exposures of the Great Oolite 
strata, and between that village and Holborn Lodge, a well 72 feet 
deep yielded the following succession of beds " : 
FT. IN. 
Cornbrash - - - - - - -30 seen. 
Great Oolite Clay - - - 14 to 15 
Great Oolite f Shaly rock (oyster bands) - 5 
Limestone. \ Hard rock (limestones) 4 to 5 
30 to 40 
Lincolnshire Limestone. 
" In the last bed water was obtained. What is most remark- 
able in this section, is the thinness of the Great Oolite Limestone, 
another example of the tendency of its beds to south-easternly 
attenuation. A somewhat similar section was found in a well 
nearer to Elton." 
Prof. Judd remarks that the Upper Estuarine Series and 
Great Oolite Limestone, that extend in outliers, from Weldon to 
Wakerley, are largely concealed by Drift, and present no 
sections of value till we reach the Great Wood south of the latter 
village. " Here the lowest beds of the series, consisting of white 
fire-clay, have been rather extensively dug . and conveyed to 
Stamford for the purposes of being made into muffles and also for 
the manufacture, in admixture with other clays, of terra-cotta." 
" The VV akerley clays are dug immediately below the peaty soil 
of the wood, to the depth of 6 feet, being found to rest directly on 
the oolitic rocks of the Lincolnshire Limestone ; and they appear 
to be here of tolerably uniform character throughout. A pit at a 
slightly lower level showed only 4 feet of white fire-clay lying 
upon the limestone."* 
Ketton to Peterborough and Stamford. 
The Upper Estuarine beds form the subsoil of Ketton Heath, 
and sections were exposed on the west side of Ketton Stones, and 
again in the Deeps, further south. The details vary in both 
sections : those which I noted at Ketton Stones were as follows : 
FT. IN. 
f Grey and brown clay - - 3 
j Grey banded clay with " race " ; and 
with ferruginous nodnles and calci- 
Upper Estuarine ) f erous gritty layers, Ostrea Sowerbyi : 10 
Series. j Blue carbonaceous clay with selenite 6 
White sand and grey clay with root- ~| 
lets - - - \ 7 
[_ Layer of ironstone-nodules - - J 
Lincolnshire Limestone. 
* Geol. Rutland, p. 198. 
