﻿Yol. 6 1.] SEQUENCE IN THE RRISTOL AREA. 237 



Productus aff. scabriculus (of two 

 types : cf. Pr. costatus and 

 Pr. semireticulatus). 



Spirifer cf. grandicostatus. 



Spirifer aff. mosquensis. 

 Spirifer cf. ovalis. 

 Beticularia lineata (cf. Dav. 

 pi. xiii, fig. 10). 



Note. — All the corals, with the exception of Cyathophyllum, are very 

 abundant. Productus aff. scabriculus teems, the more finely-ribbed form 

 being by far the most abundant. Beticularia lineata is a common 

 fossil, but the Spirifers are rare. 



Horizon e. 



Above the thickly-bedded limestones of the D 2 subzone occurs a 

 series of thinly-bedded limestones, shales, and sandstones. The lime- 

 stone-bands in this series are crowded with brachiopod-fragments. 



Productus aff. scabriculus (cf. P. costatus) ] 

 Orthotetes crenistria (mut.) J- Y l ^ 



Chonetes cf. crassistria. J common - 



Scminula cf. ficoidea and 8. cf. ambigua, Jess common. 

 Phillipsia- fragments are of frequent occurrence. 

 Note. — The Chonetes is very similar to the form found in the Tournaisian, 



but its average dimensions are much smaller. On account of its small 



size, unbroken specimens are not unusual. 



(c) The lowest Millstone-Grit Quarry. 



At the base of this quarry, immediately above the highest 

 calcareous beds which are usually regarded as closing the Upper 

 Limestone-Shales, is a sandstone crowded with casts of brachio- 

 pods, etc. 



Productus aif. scabriculus is extremely abundant, and indicates Horizon e. 

 This Productus is a different variant from that found in the Avon 

 section ; for, whereas the Avon form may be regarded as a scabriculate 

 mutation of Pr. costatus, that at Wick is a scabriculate mutation of 

 Pr. semireticulatus. 



The chief interest of the Wick exposures centres in the fact that 

 they complete the Sodbury section, by exhibiting the Lonsdalia- 

 Subzone and Horizon e which are there absent. 



(2) Quarries at Wickwar, 4 miles north of Chipping Sodbury. 



This district has already been described by Prof. Lloyd Morgan, 

 in the British Association Handbook issued at the Bristol meeting 

 in 1898. 



Detailed Account. 

 Zaphrentis-Zone. 

 Resupinata-suhzone. 

 Lithological character. — Massive limestones. 



Exposures. — Two adjacent quarries, immediately north of 

 Wickwar, on the west side of the Charfield road. 



Fauna: — 



Zaphreniis aff. Phillipsi. I Michelinia sp. 



Zaphrentis aff. cornucopia. Syringopora 0. 



