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



Magnesia (Mg 0) 9-58 



Potash (K 3 0) 1-03 



Soda (Na 2 0) 270 



Phosphoric anhydride -22 



Sulphuric ditto trace 



Titanic acid trace 



Moisture -79 



99-42 



For this analysis I am indebted to Mr. J. Mingaye, F.C.S., 

 Analyst to the Department of Mines. The chemical composition 

 shows a basic rock quite in keeping with its microscopical 

 characters. 



To facilitate the future study of the rocks of Bathurst, I now 

 append a few remarks to point out the means of seeing the various 

 features of interest in connection with the district. The passage 

 from a granitic to a slate country, and the characters that accom- 

 pany the change, can be observed in a morning's drive. By taking 

 the Peel Road, via Kelso, tertiary drifts are seen on the right 

 from Kelso to the trigonometrical station, at the first turn to the 

 right. Granite country continues until the descent is begun to the 

 valley of the Winburndale Creek. In this creek, and in a small 

 tributary already referred to, contact rocks can be noted. When 

 the village of Peel is reached the student finds himself in the 

 midst of slate country. Take the road that leads back to Bathurst, 

 via Duramana. Some worked out alluvial deposits can be examined 

 on the creek. With a local guide then follow the road to Rankin's 

 Bridge, via Kelly's farm and Duramana. About Kelly's farm 

 hornfels rocks, semi-granites, and the weathering of granitic 

 boulders can be studied. Getting on to the main road to Rankin's 

 Bridge we are again in granite country ; outcrops of the rock are 

 plentiful near the bridge. From the road near Seage's farms good 

 views can be had of the sheets of the basalt away to the south, 

 forming the Bald Hills at one extremity and Mount Pleasant at 

 the other. 



