Quart. Journ. Geol. Soc. Vol. LVI, Pl. V, 
Te 
T2> 
RIVER-SYSTEMS 
IN RELATION TO 
GEOLOGICAL STRUCTURE. 
By A.Strahan,MA., EGS. 
Scale of Miles. 
ake 10-20 30 40 
jm preety" 
WY UG SECONDARY ROCKS 
CARBONIFEROUS ROCKS 
IN SOUTH WALES 
OLD RED SANDSTONE 
SILURIAN & OLDER ROCKS 
S 
janet 
N) 
IMRIIHNN 
2 nt 
aa ont 
rede) 
wn 
we eeeeaent® 
<i 
sd Vorna Ny 
3 
tit Wi i ines ; -partings being 
(Th i i d Frome, are shewn by thick broken lines; other water -partings 
a < the limits of the basins of the Thames ani , by thie) ines 5 ee ae 
Sati see ctiad ie Saree ne ites indicate the Caledonian disturbances of South Wales:—A=the Llandilo disturbance, b 
b Zz b 
C=the Tair Carn, D=the Cribarth, and E=the Vale-of-Neath disturbance. ] 
