GEOLOGY OF NORTH GIPPSLAND, VICTORIA. 
foundation ” which is seen at the 
Black Mountain or Fanwick is no 
longer visible, having sunk below 
the level of the rivers. 
In constructing this diagram sec- 
tion, I admit that much of the sub- 
terranean representation must ne- 
cessarily be hypothetical, and its 
possible truth must depend, in a 
great measure, upon the accuracy 
of my observations and also upon 
the soundness of the inductive rea- 
soning based upon them. 
In the observations made as to 
the surface appearances, I can feel 
the confidence which has been 
created by repeated examinations 
during the last five or six years; of 
those features I have inferred to 
exist, such as the subterranean ex- 
tension of the Silurian strata of the 
Limestone River and the position 
of the central mass of quartz-por- 
phyries, I may say the following 
words :— 
At the north-west end of the sec- 
tion the limestones and slates sud- 
denly end at the foot of the por- 
phyry hills forming the east side of 
the Limestone River ; they present 
no more than the normal degree of 
disturbance or alteration, nor any 
such appearances as would lead 
me to suspect that the igneous 
rocks had come up through them. 
On the contrary, where last seen, 
they appear merely to pass under 
the great mountain of porphyritic 
rock which there forms part of 
the Great Dividing Range. These 
rocks themselves are found on ex- 
amination to be principally quartzi- 
ferous felstones, which I regard as 
merely altered ash; for almost 
everywhere the weathered surfaces 
show more or less of the fragmen- 
tary nature of the composition. I 
am informed by persons who have 
prospected for gold in the streams 
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