124 THE VICTORIAN NATURALIST. 
found in the bed of the creek, while on its banks, the rocks from 
which these minerals are derived show a stratified as well as 
crystallized structure. 
Their dip, as observed in one or two localities, is to the W.S.W., 
at an angle of about 50°, which would make their strike N.N.W. 
to §.8.H. The strata, in which the dip was taken, consist of 
micaceous sandstone, much altered and highly laminated, but 
never in the slightest degree slaty. 
They lie in the trough between the Victoria, and the Dundas 
and Black Ranges, and are in fact, not very far from the remains 
of one of the almost disintegrated ranges, which I have said earlier, 
are found running parallel with the Victoria Range, while on 
the northern bank of the Glenelg, almost opposite to the ‘Frenchman’s 
Creek, are low hills of hard white sandstone. ‘The connection of 
the gneissose rocks with the prevailing sandstone of the region is 
thus. very close, and this, taken in conjunction with their sili iclous 
nature and general strike, enable us with some confidence to regard 
them simply as strongly metamorphosed lower beds of the 
Grampian sandstone group. 
This view was partly adopted by Mr. Selwyn in his “ Geological 
Notes” of 1866. 
The metamorphism is clearly due to the contiguous granite, as 
similar rocks are never found at any distance from it. The granite 
is a fine grained and very beautiful one, and as it covers a tolerably 
wide area, it will probably be used at no distant date for ornamental 
purposes. It sends out strings and veins to the west and south, 
but these are composed of coarser materials, and look so much lke 
a syenitic granite, as to have been sometimes so classed. Itisa 
simple granite, however, consisting of flesh-coloured orthoclase, a 
blackish quartz, and good sized crystals of biotite mica, hornblende 
being absent. 
It is this coarse-grained granite which J have ment:oned as being 
responsible for much of the sand in the vicinity of Dergholm,‘and its 
connection with the ordinary fine-grained variety at Harrow and 
Balmoral can be made out without much difficulty, as the outcrop of 
the rocks is traced westwards. 
In the geological map of the colony, the presence of granite is 
noted in the Victoria valley, between the Serra and Victoria ranges, 
not only towards the northern but also towards the southern end, 
and in the exact spot where I have indicated the presence of 
doleritic lava. After traversing the valley for a distance of over 
twenty miles I have not been able to find a single trace of granite 
rock in it. For the extreme north I cannot speak from personal 
observation, but residents who know that part of the valley well, 
assure me that it does not exist even there. 
(Lo be continued.) 
