﻿Yol. 6 I.] SEQUENCE IN THE BRISTOL AREA. 241 



Lamino sa-subzone. 



Exposure and fauna. — This sub-zone is represented by beds, 

 above the lavas on both sides of the anticline, which contain 

 Orihotetes crenistria and Chonetes aft", papilionaeea, as well as 

 Cli. cf. comoides, in extreme abundance. An occasional speci- 

 men of Syringothyris aff. laminosa is found, associated with the 

 fossils just mentioned. 



These beds are, in all probability, the equivalent of the ' sub- 

 Oolite.' 



Visean. 



t$ eminula- Zone . 



The whole or part of the series, from the top of S L up to the 

 top of the zone (that is, up to the concretionary beds or 

 ' mottled limestones '), is well exposed at several points. 



Exposures : — 



(1) Dod's Quarry on the north-eastern edge of the mass, 



about 1 mile west of Dundry Hill, and three quarters of 

 a mile south of Barrow Gurney. 1 



(2) Backwell Quarry, on the northern edge of the mass,, 



nearly 2| miles west of Barrow Gurney. 

 (13) A quarry on the southern edge of the mass, about 1 mile 

 west of Wrington, on the north side of the Yatton- 

 Wrington road. 



(4) At Cleve, near the entrance to the Combe. 



(5) Near Yatton, in the small separated mass which lies. 



off the south-western corner of the Backwell- Wrington 

 mass. 

 Since the beds exposed in (2), (3), (4), and (5) are smaller portions 

 of the series, which are included in the longer sequence represented 

 in (1), and since they have no lithological or palteontological pecu- 

 liarities, it will suffice to enumerate the palieontological characters 

 exhibited by exposure (1). 

 Lithological character. — Massive limestones, with a thick 

 band of oolite, and, at the top, * mottled limestones ' with 

 thin shales. 



Fauna 



Orihotetes crenistria mut. »S l (occasional). 



Productus aff. Cora. 



Product us ' giganteus? 



Product/us sp. (cf. Pr. 6). 



Chonetes cf. comoides. 



Chon etes 'paypilionacea. 



1 Caninia cylindrica mut. 

 Lithostrotiou Martini. 

 Syringopora cf. distans. 

 Syringopora cf. ramulosa. 

 A Clisiophvllid (rare). 

 Seminula ficoidea and allied form 



The fauna! sequence and the lithological details are so remark- 

 ably similar to those of the beds in the Wick-Rock Series already 

 described (p. 236), that no further comment is necessary. 



1 Barrow Gurney lies about 4^ miles south-west of the Clifton Suspension- 

 Bridge. 



