﻿Vol. 6 1.] SEQUENCE IN THE BRISTOL AEEA. 213 



Oaninia-Zone by the abundance of Orthotetes (in association with 

 Chonetes aff. papilionacea) and the occurrence of Syringothyris 

 aff. laminosa, at its base. 



The strike in the ' Bellerophon '-quarry and in the neighbouring 

 Caninia-0 olita quarry is almost due east and west, while the dip 

 in the former reaches 27° ; by plotting these data on the 6-ineh 

 map the ' Bellerophon-~BQdL$' are found to lie about 150 feet 

 normally above the base of the oolite. 



The second ' Bellerophon '-quarry lies about 1000 yards west, 

 very slightly south of the Failand-Inn quarry, in a direct line which 

 almost exactly coincides with the strike at either quarry ; the 

 height of each quarry above sea-level is the same (450 feet). 



Hence the identity of the two beds in the two quarries, which is 

 sufficiently clear from palseontological considerations, is confirmed 

 stratigraphically, and the determination of the position of the 

 beds in the one quarry fixes that of the beds in the other. It is, 

 however, easy to fix the position of the second quarry by independent 

 evidence. 



Wraxall Piece is a wooded patch bounded on the south-west by 

 the Clevedon road ; on the west by a branch-road to Failand Farm ; 

 on the north by a grass-grown road running east and west ; and 

 on the south-east by the road to Clifton, which branches off from 

 the main Clevedon road at a point about 1250 yards east of 

 Failand Inn. The second i Bellerophon '-quarry lies on the west side 

 of the branch-road to Failand Farm, about 120 yards from its 

 commencement in the Clevedon road. 



Some 375 yards along this branch-road, opposite the western 

 end of the grass-grown road, is a small disused quarry in which 

 Chonetes aff. papilionacea, Chonetes cf. hardrensis, Orthotetes^ and 

 Spirifer were found in situ, while Zaphrentis sp. (cf. Caninia) 

 was picked up among the loose material. Hence, the beds in 

 this exposure may be, most probably, regarded as not higher than 

 Horizon y. 



About 100 yards from this point, along the grass-grown road 

 north of the Piece, is a small quarry in the lowest beds of the oolite, 

 which is proved to belong to the Caninia-Zone by the abundance 

 of Orthotetes (in association with Chonetes aff. papilionacea) at its 

 base. 



In the north-eastern corner of the Piece, by the side of the Clifton 

 road, there is a large quarry in this oolite, but the lowest beds 

 are very badly exposed, and the fossils are few and fragmentary, 

 though Orthotetes was recognized. There can be no doubt that this 

 is the same Caninia-0 olite, and that the beds here are a little 

 higher than those in the quarry just described. 



The strike both in the second ' Bellerophon '-quarry and in the 

 small oolite-quarry north of the Piece is almost due east and west, 

 and the dip is nearly 20 c . Plotting these data on the map, the 

 ' Bellerophon '-Beds are again found to lie about 150 feet above 

 the base of the Caninia-0 o\\te. 



The chief interest of these beds is, consequently, that they are the 

 Q. J. G. S. No. 242. q 



