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Abundance factor= Total no.of specimens 
otal weight of sample sample in kilograms 
Fic. 64. Lithological section of the Lower and Upper Seminula Zone in the Avon Gorge 
showing the abundance factor of conodonts in each sample, and the total weight of 
each sample dissolved in acetic acid. The samples were collected in the Great Quarry 
(ST 563740). 
