200 
LOWER OOLITIC ROCKS OF ENGLAND 
The shelly rock is regarded as part of the celebrated " BarnacK- 
rag." It is interesting to notice that the shelly facies of the 
Lincolnshire Oolite occurs at Barnack near the base of the 
series,* The Gasteropoda include the following speciest ' 
Bourguetia (Phasianella) elegans. 
Ceritella Sowerbyi. 
Cerithium Georgei. 
-wansfordiae. 
Littorina Phillips!. 
Nerinsea pseudopunctata. 
Onustus ornatissimua. 
There is a specimen of Natica cincta from Barnack, in the 
Northampton Museum. 
The above section shows the character of the strata now visible 
near Barnack ; old quarries, more or less obscure, are to be seen 
by the road south-west of the village, and west of the southern 
windmill. 
FIG. 56. 
Pit in the Northampton Beds, between Vfford and Marholm, 
Northamptonshire. (Prof. J. W. Judd.) 
(a.) Siliceous limestone (" pendle ") with mammillated surfaces'! 
below 
(6.) Obliquely-laminated, fawn-coloured sand, 1 ft. 
(c.) Purplish finely laminated clay, 3 in. 
[ ! Collyweston Slate, 
j> and Lower 
Estnarine Series. 
(rf.) Finely-laminated, fawn-coloured sands, with much oblique , 
lamination, 5 ft. exposed 
It may be questioned if the Barnack Rag is entirely exhausted ; 
the stone has been opened up, for local use, immediately to the 
north-west of the village, and there blocks weighing 3 tons were 
obtained by means of cranes. I was informed that the stone, 
when first raised, can be readily sawn, but on exposure it becomes 
* Judd, Geol. Rutland, pp. 172, 173; see also Sharp, Quart. Journ. Geol. Soc., 
Tol. xxix. p. 269. 
f Hudleston and Wilson, Catalogue of Jurassic Gasteropoda, 1892. 
