﻿Vol. 6 1.] SEQUENCE LN" THE BRISTOL AREA. 239 



Fauna : 1 



Lithostrotion Martini and vars. ] Productus 9. 

 Seminula ficoidea and allied ! Productus aff. hemispheric us. 

 forms. I Productus aff. Cora mut. 



Comparison with other Sections. — So closely does the 

 Wickwar development correspond to that in the Sodbury and 

 Tytherington sections, that the enumeration of all the points of 

 resemblance would be practically a repetition of the foregoing 

 faunal lists. The most interesting points are : — 



(1) The absence of Caninia just above the res'iqrinata-subzone, so that 



Horizon y is not differentiated. 



(2) The occurrence of Caninia in the ' sub-Oolite,' as at Tytherington. 



(3) The early occurrence of an occasional Seminula in the sub-Oolite, as 



at Tytherington and Southmead. 



(D) In the Olveston-Tytherington-Cromhall Ridge. 



This ridge forms the northern boundary of the Bristol Coalfield ; 

 it runs west-and-east, and is continuous with the north-and- south 

 Wickwar-Sodbury-Kidge, which bounds the Coalfield on the east. 



(1) Old Down. — East of Olveston, about 9 miles north of 

 Bristol, and 4 miles west of the Tytherington section. 



Large quarries in the Upper Seminula-Zone. 



Fauna : — 



Lithostrotion Martini (abundant). j Seminula ficoidea. 1 Abun- 



Clisiophyllids (occasional specimens Productus aff. Cora, mut. S 2 . J dant. 

 of Clisiophyllum 6). 



(2) The Ridge Way. — There is a disused quarry, also in the 



Upper Seminala-Zone, at the junction of the road to New 

 Passage with the Gloucester road, about 1-i- miles north-east 

 of Almondsbury. 



(3) Cromhall District. 



(a) Ley-Hill Quarry. — A little more than half a mile north 

 of Cromhall is a large road-metal quarry in the Upper Zaphrentis- 

 Zone (resupinata-subzone), Horizon y, and base of the laminosa- 

 subzone. 



1 [As the result of a recent visit to this quarry, in the company of 

 Dr. Wheelton Hind, I am enabled to add the following fossils to the 

 above list : — 



Upper Si : Productus semireticulatus (mut. S 1 ). 



Lower S 2 : Productus fimbria tus (only previously recorded in the south-west 

 by Dr. W. B. Gubbin from South- Western Gower, where it occurs at the same 

 level: Proc. Bristol Nat. Soc. ser. 4, vol. i, pt. i, p. 45). 



Cyrtina carbonaria (very abundant, and occurring at the same level as at 

 Weston and Kidwelly : see below, p. 254). 



Gasteropods belonging to several genera (Bcllerophon, Euomphalus, Loxonema, 

 etc.) are abundant (cf. Dr. Gubbin's paper, op. cit. pp. 46, 47).— A. V., April 26th. 

 1905.] 



