GEOLOGY OF NORTH GIPPSLAND, VICTORIA. 15 
Fig. 4.—Argillaceous and Crystalline Schists near Omeo. 
A. Section near the Livingstone Swamp. 
a. Surface-soil and rubble. 6. Glistening nodular argillaceous schists. 
c. Quartzite. d. Quartz vein. 
Dip about N. 60° E. at '75° to 80°. 
B. Ground-plan of contact of the argillaceous and crystalline schists from a 
gully near Livingstone Swamp. 
a. Granitic schist. 6. Nodular argillaceous schist. No well-marked contact: 
can be seen at this place between @ and 6, excepting at the sides of 
6,as shown. The nodules are unusually large, being oval and up to a 
quarter of an inch in length, 
In crossing to the eastward, these argillaceous schists are seen to 
extend beyond the Omeo Plains; but it is only occasionally that the 
rocks are visible. They appear to have been much disturbed by the 
quartz-porphyries which form the mountains of the Great Dividing 
Range on the south side of the plains, and are considerably indurated 
and altered in texture along that line. 
In proceeding southward from the plains, a gradual series of 
changes in the rocks may be traced connecting the argillaceous 
schists with the indurated slates and sandstones, which end in the 
granite of Bindi, and which have so completely the appearance and 
position of the Silurian rocks elsewhere seen to have been invaded 
by granites, that I have felt little doubt in regarding them as such. 
I think we may infer that the complete metamorphism which pro- 
duced the crystalline schists of Omeo has been subsequent to the 
first alteration of the sedimentary strata into the argillaceous schists. 
These latter rocks continue to the eastward for some distance 
beyond the plains; but the structure of the country then becomes 
marked by extensive flats of clay derived from the hills connected 
with Mount Leinster. In one place a coarse black mica-schist is 
met with, having a dip to the west of 43°. 
Passing still further to the eastward over a tract of country 
occupied by the porphyritic rocks of Mount Leinster and by horn- 
blendic granite, the crystalline schists are again found*. This is at 
* T am at present unable to assign an exact place to the interesting rock 
masses of Mount Leinster; but, from a few microscopic sections which I have 
prepared, I conclude that they probably all belong to the class of “ por- 
phyrites.” 
