194 LOWER OOLITIC ROCKS OF ENGLAND: 
FT. IN, 
n ,, f Sand .... about 1 
Collyweston L, flkte . . about 2 Q 
Slate ' I Sand. 
The pit was partially filled with water, but I was informed that 
" slates " were worked during the previous winter. 
At Wakerley the Lincolnshire Limestone attains a thickness of 
about 30 feet, and. has been quarried in numerous places. A bed 
6 to 8 feet thick of shelly rag, like the Weldon Rag, occurs near 
the base of the formation. Prof. Judd observes that some of the 
beds are entirely made up of drifted shells, usually of small size, 
the valves of the Brachiopods and Conchifera being almost always 
disunited, and the Gasteropods exhibiting equal signs of drifting 
in their broken spires and other marks of attrition. Many of 
the shells are coated with a deposit of carbonate of lime, and the 
beds exhibit much false-bedding.* Hard mammillato 1 and sandy 
beds representing the Collyweston Slate occur in thi.-. neighbour- 
hood. 
Prof. Judd states that near Morcott there are a number of 
quarries in the Lincolnshire Oolite, one of which showed the 
following succession of beds : 
T ' ol <?h' T ' e f W"* 6 ; litic limestone with some shells and 
4 Echinoderms, and a few plant-remains (stone burnt 
I for lime). 
p-,, Q1 , f Calcareous sands, 
ooiiyweston 5 j Hard> blu6) giliceous ii mes tone, with few shells but 
T ^O+T a i, 10 ^ rcany plant-remains, the latter sometimes well 
S ri = ' I .preserved (ferns, &c.) (stone used for road-metal). 
l_Fine, white sands (used for mortar). 
Much of the limestone at Morcott is compact and marly, and 
devoid of oolitic grains. From this locality Prof. Judd obtained 
a very fine example of Ceromya bajociana, 6| inches in length 
and 4^ inches in breadth ; also the following characteristic 
forms : 
Natica cincta. 
Lima. 
Modiola sowerbyana. 
Pinna cuneata. 
Galeropygus agariciformls 
Pygaster semisulcatus. 
Uppingham to Stamford. 
The following notes are from Prof. Judd's Memoir : 
At Bisbrook the line of junction of the Northampton Sand 
and the Upper Lias is indicated by numerous spring?. The 
lowest beds of the former series were at one time dug at this 
place for lining ovens, a purpose for which they are said to be 
admirably adapted. 
At Glaston there occurs, at the base of the Northampton Sand, 
a very hard, somewhat calcareous band, which is crowded with a 
shell which closely resembles, if it is not actually identical with,. 
Rhynchonella cynocephala. 
* Judd, Geol. Rutland, pp. 153, 154, 178 ; Sharp, Quart. Journ. Geol. Soc., vol. 
xxix. pp. 237, 238 ; Morris, Geol. Mag., 1869, p. 103. 
