226 LOWER OOLITIC ROCKS OF ENGLAND: 
which Lucina bellona, Trigonia hemisph&rica, var. gregaria, and 
Rhynchonella spinosa ? were obtained. Oolite has been quarried 
near Hibaldstow on the north, and not far from Siurton on the 
south.* 
North of the railway-tunnel at Kirton Lindsey there is an 
outlier of Hibaldstow Beds, and the following strata were shown 
in a quarry : 
FT. IN. 
r Limestone with scattered oolitic grains 2 3 
Lincolnshire 1 Oolite - - - - - 4 6 
Limestone. ~| Irregular hard grey limestone, with 
I scattered grains of oolite. 
From the beds at this locality Mr. Ussher obtained some Corals 
and a Trigonia. 
Mr. Fox- Strang ways remarks that further north the Hibaldstow 
Beds consist of white very oolitic limestone, which is much purer 
and softer than the Kirton Beds below. A peculiar feature in the 
structure of the rock is that the oolitic grains are often aggregated 
together into small lumps about the size of a bean, \\hich give it, at 
first sight, almost the appearance of a conglomerate. 
He states that in an old quarry by the road to Santon the lower 
part of this series is just exposed, forming a rubbly oolite, which 
is frequently decomposed into a kind of sand. The Hibaldstow 
Beds about here appear to be very thin, but perhaps the increased 
dip may in great measure account for the narrowness of the 
outcrop, or, what is more probable, the limestone may have been 
denuded before the deposition of the Great Oolite Clay above, as 
there appear to be indications of an unconformity between the 
two in this neighbourhood, f 
Referring to the Kirton Beds of Appleby and Winterton, Mr. 
Strangways states that they comprise the greater part of the 
Lincolnshire Limestone, and about Appleby cover a larger surface 
than the rest of the Lower Oolite divisions put together; they 
consist for the most part of siliceous earthy limestones, which 
become purer as we ascend in the series. The lower part of these 
beds is seen in the cutting at Santon, the upper beds are exposed 
under the Hibaldstow Beds in a quarry close by ; thence the 
outcrop extends in a westerly direction along the ridge formed by 
Santon and Risby Warrens. Between Winterton and Roxby the 
lower part of the Kirton Beds contains layers of rubbly or brashy 
limestone, including a representative of the so-called " Hydraulic 
Limestone." That they should be mapped rather as the base of 
the Kirton Beds, than as a part of the Basement Beds, seems 
evident from the section by the lane on either side of the Railway 
Bridge at Low Santon (a Farm three-quarters of a mile west* of 
Appleby Station). There, as far as the tumbled character of the 
beds permits observation, the following section has been 
obtained by Mr. Ussher : 
* Ussher, Geol. N. Lincolnshire, pp. 73, 74, 77, 78. 
| Geol. N. Lincolnshire, pp. 78, 79. 
