BRITISH AVONIAN CONODONT FAUNAS 
Distribution and relative abundance of species of 
Spathognathodus and related genera. 
Pseudopolygnathus sp. 
S.tridentatus Scrassidentatus 
tatu 
eat ee S.costatus ss. 
S.elongatus 
S.anteposicorni Sure susie 
S.cyrius 
Percentage of 
total conodont 
S.plumulus ss. 
Clydagnathus 
cavusensis 
fauna 
S.plumulus 01%. 
nodosus Pseudopolygnathus 4-5°%o 
vogesi B16 oe 
= lo 
2044S plumul ig nae 
shirleyae 
Fic. 10. Distribution and relative abundance of species of Spathognathodus and related 
genera in the Z and K Zones of the Avonian of the North Crop. 
33 
