FOREST MARBLE : STONY STRATFORD. 379 
These beds are evidently the same as those exposed in the 
valley rear Tingewick, and in the old clay-pit on the Bourton 
road near Buckingham. 
In the Museum of Practical Geology there is a polished 
specimen of Marble from Buckinghamshire (see p. 481) ; and 
also some curious flat calcareous concretions (of the nature of 
" race ") from the Forest Marble Clay at Graves' Brickyard, near 
Buckingham. 
The blue shelly and oolitic limestones, that form the charac- 
teristic portion of the Forest Marble are now lost sight of, and 
beds resembling them are only occasionally seen further north, 
between Stony Stratford and Newport Pagnell, at Stowe-nine- 
churches, and elsewhere in Northamptonshire. These beds will 
be noticed under the heading of Great Oolite Clay ; but other 
beds resembling the Forest Marble occur in the Great Oolite 
Limestone, as at Alwalton, south-west of Peterborough.* 
* See also Judd, Geol. Rutland, p. 21(5. Some references to the Forest Marble 
and" Cot ubrash, near Gayhurst, are made in a paper by J. H. Macalister (Geologist, 
vol. iv. p. 215) ; he however has not distinguished between the Great and Inferior 
Oolite of the district. In a later paper (Ibid. p. 181), he has given lists of fossils 
from the Great Oolite Series of North Bucks, c., but the horizons are not clearly 
separated. 
