185 
it completely on the particular line chosen for the Railway, 
and this channel was filled with a fine and easily excavated 
_ sand, in very marked contrast to the rock, whose removal proved 
“an exceedingly laborious undertaking. The contractors, Messrs 
_Warson, Son, and Warson, have very kindly allowed me to 
_ examine the Section of their preliminary boring, which it may 
be useful to give :— 
ft. in. 
1—Soil and gravel, corresponding to (1&2) ... about 3 0 
2—Clay oe " w (3) Se Eaetat oewO) 
38—Sand =; " uw (A, 5,6) ... inet i 
4—Rock (probably upper part of 7) + SE OFKS 
5—Sand u u ” (7 & 8) ee S23 
6—Clay, corresponding to (9) Jo 3 6 
_ The numbers in brackets correspond, as will be seen, with 
the numbers in my Section, (p.177.) The fact that this boring 
only meets with about nine inches of the “rock” (No. 4 above,) 
which is really, as we know, about six feet thick, coupled with 
boss of the Calcareous Sandstone on one side of the channel, 
and had then continued through the fine sand which fills it up. 
As the sand was gradually removed the deep channel which 
it filled came day by day into fuller view, and its remarkable 
features were at length completely disclosed. It was first 
described to me as a collection of gigantic boulders, and so 
improbable an occurrence sent me off to examine it at once. 
It was shortly after its complete excavation that the Club 
paid a visit to it, and the accompanying photograph was taken 
few days after, before the blasting operations had destroyed the 
n features of the spot. The photograph is taken from near 
Kast end of the cutting, and looks on the northern side 
westward through the cutting. 
The channel varied in breadth from 5—6 feet to 15—18 feet. 
[he photograph shows fairly well the sides of the channel stand- 
ing out in relief, the rock worn into rounded bosses of varying 
izes, while in some cases huge mushroom-shaped masses stand 
ed on the underlying sand, but still in continuous line 
