BRITISH AVONIAN CONODONT FAUNAS 21 
Massive grey foraminifera-bearing limestones, which are oolitic in places, form the 
lower beds of the D; Subzone of the Dibunophyllum Zone. A few pseudobreccias 
are also developed. The Upper D, Beds consist of coarse oolites, alternating with 
thin shales and grits. In the Dg Subzone the lowest beds show an alternation of 
grits, limestones and shales. Higher in the section there are grey oolitic limestones, 
which contain foraminifera, crinoids and corals. The highest beds of the section 
consist of shales and grits, which are heavily stained with haematite. 
The section was sampled at ten-foot intervals, Vaughan’s (1906) zonation and 
description being used as a basis for the collecting. The section sampled was sub- 
divided into nine traverses (Fig. 5). These were as follows :— 
1. The riverside traverse of the K Zone. Leigh Woods side of the Gorge. (ST 
556 746). 
Sample numbers K1-K17. 
2. The top of the K Zone and the basal 30’ of Z; Quarry 1. Leigh Woods side of 
the Gorge. (ST 557 745). 
Samples K18-Kar and Z1-Z1o. 
3. The Z; Limestone traverse in Black Rock Quarry. Clifton side of the Gorge. 
(ST 561 747). 
Sample numbers Z11-—Z2o. 
3) |Press Quarry 
0) N 
IN Black Rock Quarry 
2) 
von \\eutly Oolite 
(6 
(7) 
CLIFTON DOWN 
\o! Great Quarry 
300 YARDS Blas 
zag 
Bridge Valley Rd. 
Leigh Woods Y 6) if 
KEY 
Railway ———__ 
Road =—— 
Traverse No. (5) 
Clifton 
* Suspension 
Bridge 
ae a 
Fic. 5. Sketch map of the Avon Gorge, Bristol, showing localities mentioned in the text. 
