556 
Opals and other precious stones form at present the chief mineral wealth of the 
formation. 
The opals are found in nodules of ferruginous siliceous sandstone and siliceous 
ironstone, either in the “ Desert Sandstone ” or denuded out of it, and lying on the 
surface of the underlying “Uolling Downs ” formation. 
Drora the following places valuable opals have been obtained : — 
Pleasant Creek , . , 
... S. Lat. 25 23 
E. Lone. 145 15 
Bulgroo and Kyabra Creek 
„ 25 50 
a 
143 35 
Costello*s Creek ... 
25 57 
142 47 
Mayne River 
23 32 
)) 
141 32 
Ifickavilla 
„ 26 20 
144 20 
Winton 
„ 22 32 
143 12 
Boulia 
„ 22 55 
a 
143 0 
J. 
