268 BRITISH AVONIAN CONODONT FAUNAS 
4 | 
70 | 
3| 2 
fe} 
«1 
Ola 
w W 
ai 
Neale 
20) wl] w 
=] w 
316 
a 
SE: 
01 5 
a ee 
U 
10 | 
‘ 
° 
40 60 80 
Abundance factor =Lota! no of specimens Total weight of sample 
Total weight of sample in kilograms 
Fic. 83. Lithological section of part of the Lower Limestone Group in Midlothian : 
the North Greens Limestone, showing the abundance factor for each sample and the 
weight of each sample dissolved. For localities see p. 30. 
