CARBONIFEROUS LIMESTONE SERIES. 
197 
D i-beds, with the usual fossils, are exposed at a number of 
points in the northern part of Ashton Hill Plantation, while grits 
and limestones of D 2 age are seen at the south-eastern corner of 
George's Hill Plantation. 
Two small patches of limestone are seen in the railway cutting 
to the east of the Fruit and Cider Institute, Long Ashton, and 
a tongue folded into a sharp anticline is traversed by the Great 
Western Railway by means of a cutting and short tunnel at 
Cambridge Batch J mile E. of Flax Bourton Station. All these 
exposures are in D i-beds as are the old quarries just N. of the 
railway at Cambridge Batch. These quarries form one of the 
best localities in the district for the examination of the D i-beds, 
and were described by Vaughan. 1 The great width of the D out- 
crop here is probably due to a roll in the strata. The most 
westerly exposures of D-beds are seen in the south-eastern part 
of Tyntesfield grounds, but are neither good nor numerous. 
V. — Conclusion. 
The general lithological and faunal succession was determined 
by Vaughan, and although it is hoped that the proximity of the 
area to Bristol will justify the somewhat detailed account of the 
exposures given above, it cannot be claimed that many points of 
general interest have been established. The following seem 
worthy of mention : — 
1. While the exposures are not sufficient to enable one to 
determine the thickness of the several bands with accuracy, the 
width of the outcrops indicates a progressive thickening of the 
strata as one passes westward. 
2. The occurrence of a marked band of coarse oolite imme- 
diately underlying the Bryozoa Bed (K 1) at Abbot's Leigh and 
in the Failand and Charlton area is a feature known elsewhere 
in the Bristol district only in the Western Mendips (Burrington 
Combe) . 
3. The occurrence of strong grits in Si to the W. of Wraxall 
is a feature characteristic also of the development at Sodbury 
and Olveston in Gloucestershire. 
Sincere thanks are tendered to the Hon. Mrs. Smyth for permis- 
sion to visit exposures in the Ashton Court Estate, and to Lieut. - 
Col. G. C. Gibbs, M.P., for similar permission with regard to 
Tyntesfield. 
1 Bristol Paper, pp. 218-9. 
