BRITISH AVONIAN CONODONT FAUNAS 267 
U 
60 | Paper 
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Abundance factor=Total no. of specimens’ Total weight of sample 
Total weight of sample in kilograms 
Fic. 82. Lithological succession of part of the Lower Limestone Group in Midlothian : 
the ‘“‘ Gilmerton’’ Limestone, showing the abundance factor of each sample and the 
weight of each sample dissolved. This limestone may not be the true Gilmerton 
Limestone (see p. 50). For localities see p. 30. 
