Cli. XXI.] 
TRANSVERSE VALLEYS. 
299 
CO 
Mr. Martin has suggested that the great cross fractures of the 
chalk which have become river 
channels have a remarkable 
correspondence on each side 
of the valley of the Weald ; 
in several instances the ffor- 
ges in the North and South 
Downs appearing to be di- 
rectly opposed to each other. 
Thus, for example, the defiles 
of the Wey, in the North 
Downs, and of the Arun in 
the South, seem to coincide 
in direction ; and, in like 
manner, the Ouse is opposed 
to the Darent, and the Cuck- 
mere to the Medway *. But 
we think it very possible that 
these coincidences may be 
accidental. It is, however, 
by no means improbable, as 
hinted by the author above 
mentioned, that the great 
amount of elevation towards 
the centre of the Weald dis- 
trict gave rise to transverse 
fissures. And as the longitu- 
dinal valleys were connected 
with that linear movement 
which caused the anticlinal 
lines running east and west, 
so the cross fissures might 
have been occasioned by the 
intensity of the upheaving 
force towards the centre of 
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* Geol. of Western Sussex, p. 61. 
