80. ON THE WAIANAMATTA SHALES. 
ent hills we shall see how they could not have belonged to one 
plateau. The shale on Mount Sugarloaf is about 700 feet above 
the sea ; that on Razor-back Range is in places 500 feet: higher. 
There is no dip from one to the other, and there are apparently 
i to 
4 fo) 
shale than any other part of the formation. Finally, the character 
of the shale is not that of a large deposit which has filled up the 
surface; in fact, wherever it can be fairly followed, it is found 
to bea mere seam rarely more than a few feet in thickness. T0 
to 600 than 300 feet, but when each of these hills is examined i 
detail the shale is discovered to be aseam amid the Hawkesbury 
rocks. Thus, at the end of Woodhcuse’s paddock (Mount Gilead), 
Sugarloaf, sandstone takes its place. At Brook’s Point another 
thick seam of shale is seen to be covered by the sandstone. Many 
. 
° 
> 
g 
s 
3 
3 
= 
& 
es 
= 
a 
3 
S 
& 
Q, 
3 
ie) 
% 
5 
4 
@ 
ee 
mn 
y 
° 
_s 
= 3d 
mee 
=] 
gQ 
Bs 
F 
# 2 va 5 > ° 
these there is a steady rise, very slight and gradual it is true, but 
