208 W. R. BROWNE. 
desolate appearance. It is due to the disintegration of 
quartz-porphyry, of which there is a very extensive 
development along the road to Bredbo. The shifting of 
the sand by the action of the wind has the effect of drifting 
up the road in many places, of burying ie and of 
destroying vegetation. 
Quartzitic conglomerate.—At various points in the 
Cooma district One comes across outcrops and boulders of 
a Silicified quartz-conglomerate, apparently forming a sur- | 
face capping to the slate, etc. Just north of the Myalla 
Road syenite masses of this conglomerate are seen, and 
here too we get a dense bluish-grey quartzite, evidently 
connected with the conglomerate. No evidence could be 
found as to the age of these occurrences, or their relations 
with other formations: they are probably the result of 
deposition from silica-bearing solutions, but whether these 
were connected with the late igneous intrusions, or are of 
much more recent date it is impossible to say. 
III. Economic Geology. 
Bushy Hill.—The Bushy Hill gold mining field is dealt 
with in the Annual Report of the N. 8S. Wales Department 
of Mines for 1898. A number of references are made to it 
there, including the report of the Chief Inspector of Mines, 
with petrological appendix by Mr. G. W. Card. 
The occurrence of gold at Bushy Hill was noted about 
16 years ago, and a certain amount of mining work was 
done, but, though some good results were obtained, for 
various reasons work was abandoned almost completely. 
Gold, copper and lead ores have been obtained. In the old 
days only the gold was sought after, some good values being 
obtained from the surface free gold. Telluride yielding 
high percentages was found, but not in great quantity. The 
copper occurs as auriferous pyrites, apparently in consider- 
able quantity in places. At present copper is being 
