260 
BRITISH AVONIAN CONODONT FAUNAS 
Fic. 73. 
= 
u 
i 
Ul 
TO 198/K 
Ee TES 
falta 
UF 
ie niita 
aga 
I 
Le 
! 
4 
H 
EE] 
ey 
si EL 
Abundance factor= lotalno.of specimens Total weight of sample 
Total weight of sample in kilograms. 
Lithological section of the D3 Subzone of the North Crop of the South Wales 
Coalfield showing the abundance factor of conodonts in each sample, and the total 
weight of limestone dissolved. For details of collecting localities see Fig. 7 and also p. 23. 
