INFERIOR OOLITE: BARNACK. 
201 
" as hard as iron," turning the edges of tools. On this account 
masons do not like it, and the stone is not sought for by them. 
The oolite beneath the rag, furnishes a good workable freestone ;* 
but beds of variable quality are associated with it. South-west of 
Barnack, where the rag-beds occur in a decomposed form at the 
surface, they are 6 feet thick, and underlaid directly by a thin 
band of compact limestone with scattered oolitic grains : free- 
stone occurs below. 
A well sunk to a depth of 26 feet, through these rocks into the 
sandy beds below, obtained a good supply of water. 
Prof, Judd remarks that at Ufford, south-east of Barnack, the 
white sands of the Lower Estuarine Series are highly micaceous, 
and contain many thin layers of lignite and fragments of wood. 
One of the pits afforded the following section (Fig. 57) : 
FIG. 57. 
Section of Northampton Beds 
Northamptonshire. (Pi 
in a pit east of Ufford, 
of. J. W. Judd.) 
(a.) Oolitic limestone.") 
(6.) Yellow, sandy [ 
limestone, with f 
marine shells. J 
(c.) Bed of lignite,'] 
3 inches thick. 
* Fragment of fossil 
wood. 
(d.) Pale-purplish, 
micaceous clays, 
with vertical car- 
bonaceous remains 
of plants, 3 ft. 
Lincoln- 
shire 
Lime- 
stone. 
O) 
White and fawn- 
coloured sands, 
with vertical plant- 
remains, 3 ft. 
(/.) Thin seams of 
lignite, together 4 
inches thick. 
(gr.) Bed of very fine 
white sand, 1 ft. 
6 in. 
Yellow sands, 
becoming more 
and more ferrugi- 
nous downwards, 
dug to 4 ft. 
(b) is similar to and corresponds with (a) of the section, Figure 56, on page 200. 
* See note on microscopic characters, by Mr. Teall, p. 11. 
