248 
2 2 COIN 
mh 
C 
fo} 
4 
ta 
Abundance factor = 
BRITISH AVONIAN CONODONT FAUNAS 
60 1 
Total no of specimens Total weight of 
Total weight of sample sample in kilograms 
Fic. 61. Continuation of the lithological section of the Upper Zaphventis Zone (y Beds) 
in the Avon Gorge showing the abundance factor of conodonts in each sample dissolved 
in acetic acid. Samples Z 34—Z 38 were collected in Quarry 2 (ST 558745). 
