254 
‘ 
75 
‘ 
50 
/ 
25 
Fic. 67. 
AV ONIA N 
ZaOuN ne: 
D 
BRITISH AVONIAN CONODONT FAUNAS 
1H 
t 
rH 
a et et 
1 —)}) 
be et 
° 20 40 60 80 
Abundance factor = [otal no of specimens Total weight of 
Total weight of sample sample in kilograms 
Lithological section of the Lower Dibunophylium Zone in the Avon Gorge showing 
the abundance factor of conodonts in each sample dissolved in acetic acid. Samples 
D 1-D 9g were collected from the roadside exposure (ST 564737). 
