BRITISH AVONIAN CONODONT FAUNAS 257 
Z ZONE 
nN 
pe Zu 
dtl 
= 
xz 
n 
= 
° 
4! 4 
Al I 
' ie 
F110 
414 
dt | 
LAL, 
Pal 
\r~ 
é 
o 
OrUAo 
mp 
taDe0 
e 
l 
lea 
dt 
Leo! 
bes! 
A 
LLM 
Yl 
Z 
Y 
: 
a 
WMA 
K ZONE 
=a 
AVONIAN 
J 
i 
Hy 
za 
i= 
ea 
ITOUONE 
\ 
sa 
c, 
41°58 
(oe) id 
a5 
40 
9 40 
4lo-i(4 
9.08 
OL 
El 
( 
é 
ay 
Blea 
Oa 
ot 
ge 
Total no. of specimens Total weight of sample 
undance factor = ‘ 
a Total weight of sample in kilograms. 
DEVONIA 
Fic. 70. Lithological section of the K Zone of the North Crop of the South Wales Coalfield 
showing the abundance factor of conodonts in each sample, and the total weight of 
limestone dissolved. For details of collecting localities see Fig. 7 and also p. 25. 
