192 
CARBONIFEROUS LIMESTONE SERIES. 
(3) The Syringothyris (C) Beds. 
With the exception of the C anini a-oolite, the rocks of this 
horizon are not often well seen. No exposures of importance 
are met with between the Avon quarries and the Abbot's Leigh 
road. The C anini a-oolite and base of the overlying dolomites 
were exposed in 1916 in some military trenches in the field S.W. 
of Beggar's Bush corner, and the narrow woods stretching N.E. 
and S.W. from Upper Farm stand on the oolite which is 
frequently exposed. The Observatory Hill fault passes near 
Upper Farm, the exposure just alluded to lying to the S. of 
the fault, while an old quarry about 300 yards due W. of the 
Farm is in the C anini a-oolite N. of the fault. The Caninia- 
oolite is further exposed in the large quarry near the eastern 
end of Wraxall Piece, and after the outcrop has been shifted 
N. by a fault, at several points on the north-western border of 
Wraxall Piece and at one near the N.W. corner of Sixty-acre 
Plantation. 
The Laminos a- dolomite is rarely seen, but a small exposure 
of the base of this horizon and of the top of horizon 7 occurs 
nearly opposite the farm K. of Failand Lodge. The Caninia- 
oolite is also seen in an old quarry S. of the Clevedon road and 
opposite the end of the road from Lower Failand. 
Immediately to the W. of this quarry a fault shifts the out- 
crop northwards, and to the W. of it the outcrop of the C-beds 
widens. The C anini a-oolite, which remains the only horizon 
commonly exposed, is well developed in the old quarries at 
Charlton Cottages, and is seen at several points near the road to 
the E. of the cottage called White House, where the Clapton 
and Tickenham roads diverge from one another. There is also 
a quarry in this band S. of the point where the track to Cadbury 
Camp leaves the main road. The tract of country formed by 
the C-beds extending westward from Charlton Cottages yields 
a more fertile soil and is more cultivated than is usually the 
case locally with the Carboniferous Limestone. 
To the W. of the fault running from near Nash House to 
Birdcombe Court the outcrop of the C-beds widens considerably 
and there is more than one possible explanation of this. Before 
considering these, the exposures, which are not numerous, will 
be described. The outcrop of the C anini a-oolite may be traced 
from near the southern end of Mogg's Wood, where it is well- 
seen both E. and W. of the wood past Tickenham House to the 
western end of Summerhouse Wood, where it is again visible. 
Along the valley to the N. stretches a tongue of Trias, and to 
the N. of this is a further series of exposures in white, more or 
less oolitic limestone, one at the south western corner of Chum- 
mock Wood, a second in the south-eastern corner of Sir John's 
Wood being in a foraminiferal limestone crowded with 
Calcisphcera. Nearly on the same line of strike are exposures 
of white oolite on the north-eastern side of Cadbury 
