44 THE VICTORIAN NATURALIST. 



A similar feature is observed several chains to the south-west, 

 but owing to the angle of junction being somewhat in the same 

 direction an additional anticline and syncline with minor flexures 

 come in on the south-east, the anticline being beautifully shown 

 in the face of a somewhat remarkable peak. 



At the actual junction the Granite has invaded the Silurian 

 along the bedding planes and joints. Some narrow veins appear 

 to be composed of quartz, and others — one of which is five yards 

 wide — of felspar, with a little quartz, greatly resembling graphic 

 granite. In places the Silurian is fractured, the fragments being 

 mixed through and partly absorbed by the granite. Small slabs 

 of quartzite, sandstone, and nodular clay slate are observed at 

 some distance from any known contact point, and, strange as it 

 may appear, they still retain the normal strike and dip. 



In many cases these fragments have been absorbed by the 

 Granite, the only evidence of their once existence being a darker 

 ))atch of finer crystallized material. Similar gradual changes 

 from sedimentary to granular rock can be observed in many 

 places. 



The Granite in contact with and for some little distance west 

 of the Silurian is of a slightly different type to that forming the 

 mass, a fibrous or gneissose structure being developed. Jointing 

 is well marked, one set being east and west with a dip of 70° N., 

 another set N. 12° E. at about 90°. Numerous quartz veins 

 intersect the granite, and several large bodies of rock, probably 

 dykes, run in a north and south direction ; these being some- 

 what harder than the country rock, they can be traced over 

 the surface for a considerable distance. 



The Granite country is generally open and undulating, with 

 tors and bosses showing above the surface. Along the water- 

 courses cliffs and bluffs, more or less steep, have been cut by 

 the streams. 



The Granite extends to the west for two and a quarter miles, 

 the junction with similar sections of Silurian being observed a few 

 yards above the junction of Pyke's Creek with the Werribee, and 

 continues to within a few chains of the Ballarat and Melbourne 

 road. 



The sections seen in the cuttings on the railway between 

 Ingliston and the gate-house No. 24 are, owing to their recent 

 exposure, of a much lighter colour than the Werribee and Pyke's 

 Creek sections. Several bands of blue-black shale are inter- 

 bedded with the light-coloured rocks ; they appear to be more 

 numerous than they really are, owing to folding. 



In conclusion, I would call attention to the vegetation growing 

 on the various geological formations. Perhaps the most striking 

 illustration of this is seen to the south of the Granite junction 

 in the Werribee River, where a dense growth of Prostanthera 



