THE AVONIAN OP THE AVON GORGE 
127 
great numbers, and a few specimens of the subzonal index, 
Syringothyris cf. laminosa, can always be seen. 
We may now proceed at once to Quarry 2, which is in con- 
tinuous work. 
A thin capping of ^ammosu-dolomites overlies the 
massive y bed at the southern end of the quarry, 
but is inaccessible. 
Z,. 
Horizon y is exposed at the southern end of the quarry and 
fossils can readily be made out on the rock-faces. 
Caninia cylindrica, Zafhrentis aff. Phillifsi and Zaphrentis aff. 
cornucopicB are the most abundant forms. 
The ‘ Fish Beds ’ yield large numbers of palatal teeth (Psam- 
modus, Orodus, etc.) but spines can rarely be obtained. 
In the lowest beds, at the northern end of the quarry, Brachio- 
pods are abundant and constitute a characteristic Zaphrentis 
assemblage. The commonest forms are : — 
Spirifer aff. clathratus, Orthothetes cf. crenistria, Chonetes cf. 
hardrensis, Athyris afl. glabristria, Syringothyris aff. cuspidata, 
Reticularia cf. reticulata and Phipidomdla aff. Michelini. 
The earliest occurrence, in the Bristol Area, of a corrugate 
Productus is recorded from these beds. 
Proceeding to Quarry 1, which lies immediately north of 
Quarry 2, the lowest beds of Quarry 2 are seen to form the upper- 
most beds of Quarry 1. 
Zi and K 2 - 
The most interesting portion of the quarry is, however, the 
northern end, where the lowest beds are exposed. 
A small cutting faces the entrance and, here, the uppermost 
beds of the Cleistopora-Zone can be examined. They consist of 
shales and thin limestones in which Brachiopods are abundant. 
The zonal index, Cleistopora cf. geometrica, has been obtained 
from this cutting. 
