246 BRITISH AVONIAN CONODONT FAUNAS 
° 5 10 15 20 
—— titi 
K20 ea U“f 
K19 wl Uy 
K 18-71 Wltsbéd: 
Hint 
Rt 
jpiagh 
te 
Iii 
MAS 
i 
| 
limi 
4 
@ 
iD | 
Ia 
sil “ 
! 
} 
i 
NN 
Ld aw 
CT aH ey UH 
Wy 
Arathi Ah 
Hall 
ie H UW 
i 
ait 
i 
I 
| 
| 
\ 
an 
I 
Y 
TJ 
JM 
Z 
fo] 5 
Abundance factor = Total no.of specimens _ Total weight of sample 
Total i in ki 
Fic. 59. Lithological section of the Cleistopova Zone in the Avon Gorge showing the 
abundance factor of conodonts in each sample, and the total weight of each sample 
—K17 were collected in the ri ide section of the 
18-K 21 w 
dissolved in acetic acid. Samples Kr 
Avon Gorge (ST 556746). Samples K 
Gorge (ST 557745), see Text-fig. 2 
