GEOLOGY OF NORTH GIPPSLAND, VICTORIA. 9 
Nowa Nowa, near Bindi, at the Reedy River (which is one of the 
feeders of the Buchan), and in other minor localities which need not 
be further specified. In the country between the upper waters of 
the Mitchell and Macallister rivers Silurian strata probably underlie 
the Upper Paleozoic groups. 
The strata which I regard as Silurian consist of alternating slates 
and sandstones, with rare bands of crystalline limestone in the upper 
part of the series. These have been tilted, folded, compressed, and 
subjected to influences which have produced alterations lying be- 
tween a schistose and a flinty structure. They have subsequently 
been extensively denuded before the deposition upon them of later 
formations. The strike of these strata naturally varies, owing to 
the many disturbing causes which have affected them. I have 
found some difficulty in determining the average direction of strike ; 
but, from the consideration of all the observations which I have 
been able to make throughout the district, I believe that the average 
strike will be found to le between 35° to the west and 20° to the 
east of north. The dip appears usually to be between 60° and ver- 
tical, and varies rapidly ; but I am inclined to believe that it is more 
generally to the eastward than the westward, and would therefore 
indicate not only a general acute folding, but also a subsequent 
tilting over to the west. 
I have observed in two localities, near Dargo Flat and Neoyang, 
where the contact with the granite has been laid bare by denuda- 
tion, that the strike has turned nearly east and west, the dip being 
both against and from the granite. 
The largest Silurian area is situated, as [ have said, between the 
Mitchell and Tambo rivers, and extends from the Great Dividing 
Range to near the sea-coast. Broadly viewed, it is a country of 
deep valleys and corresponding high and steep ridges, among which 
occasional outcrops of granite are to be found. ‘These are usually 
in valleys, but also in some cases as mountains, such as Mount 
Baldhead. ‘The Silurian mountains are in places capped with out- 
liers of Upper Paleozoic strata, or with Tertiary volcanic outflows. 
Here are situated the alluvial gold-workings of the Crooked, Dargo, 
Wentworth, Tambo, and Nicholson rivers, of Merrijig and Boggy 
Creeks, of Shady Creek and the Haunted-Stream, and other places, 
and the quartz-mines of Grant, the Upper Dargo, Boggy Creek, and 
Deptford. 
The second area, as to size, is, as I have said, east of the Snowy 
River. The country is one of steep and high mountains, gradually 
culminating in the chain known as the Coast Range. Their struc- 
ture is perhaps best seen at the Deddick River, and I shall refer to 
that as an illustration*. The general features are that the summits 
of the mountains are of highly inclined strata, usually much indu- 
rated, so that the slates are flinty and the sandstones quartzites, 
In many places the original structure of the rocks is almost oblite- 
* The Deddick River is also called, in parts of its course, the Tubbut, Jinigal- 
lalla, and Bonang, these being the native terms for the various localities through 
which it flows. 
