202 ON THE GEOLOGY AND PETROGRAPHY OF BATHURST, N.S.W., 



3. A granitic dyke, with inclusions of a schistose hornfels. The 

 general direction conforms to that of the slate. It consists of 

 felspar, quartz and white mica. Besides the mica distributed 

 through the rock, there occur nests of the same mineral, oftentimes 

 with the mica contorted and broken. 



4. Spotted slate, with occasional thin veins of quartz. 



5. A dyke of granite, with large felspars and white mica. There 

 are layers of white mica on every joint. 



6. Slate. 



7. Coarse granite, with parallel jointings. 



8. Spotted slate. 



9. Granite vein, some six yards wide, in places almost as fine- 

 grained as a felsite. The rock is rendered porphyritic in places 

 by nests of silvery mica and felspar. There are also thin veins of 

 quartz. 



10. A thick belt of spotted slate, nearly two hundred yards 

 wide, with occasional thin veins of quartz. 



11. A vein of granite, with black mica. 



So far, although we are approaching the main granitic mass, 

 neither black mica nor hornblende has yet been developed. 



12. Boulders of porphyritic granite, with dark fine-grained 

 inclusions. 



13. Beyond these last named rocks there are few exposures of 

 the bed rock, but some hundred yards further on the typical 

 Bathurst granite is met with, containing both hornblende and 

 black mica. 



The succession here detailed points out that the actual junction 

 between the older and newer rocks is a wavy line with sharp and 

 deep bends. In one place the granite runs into the slate in dykes 

 and veins, while between these there are left jutting points and 

 arms of the old rock standing between walls of granite. Junctions 

 of a similar nature are described by Mr. A. W. Howitt in his able 

 paper on the Diorites and Granites of Swift's Creek.* 



* Transactions of the Royal Society of Victoria, Vol. xvi. pp. 11-87. 



