36 



In case 128, near tlie door, will be seen quartz from the 

 Madman's Eeef, Stuart Town : a complete section across the 

 reef. 



Case 54. Cargo, Forhes, Pealc Hill. JParJces. — 9052, Homeward Eound 

 Mine, Grenfell : gold seated on blende. 9051, from the same 

 mine : showing gold seated on arsenical pyrites. 



7703, country rock (slate) from the Tomingley Mine. This is 

 one of the very few instances in which fossils have been found in 

 the slate whicli so commonly constitutes the country-rock of 

 our gold-fields. [Kumerous fairly well-preserved remains of 

 low'ly forms of marine organism known as graptolites have been 

 found in th.e mine, and by their means it has been proved that 

 the slate is of Lower Silurian (Ordovician) age. The impressions 

 of the graptolites can he easily seen on 7708. Better specimens 

 will be found in Fossil case 1. 



6492, 2160, and other specimens of gossan from Peak Hiil 

 should be compared with the surface ore from Mount Morgan 

 (Queensland) in case 80, the iridescent appearance beiug very 

 similar. 



2145, Condobolin : red clay-slate, on which fine gold is readily 

 visible. Numerous similar instances of gold occurring in this 

 way will be found in the collection. 



2503, Koh-i-noor Mine, Parkes : white quartz. Tet another 

 instance of gold occurring on blende, several such having been 

 already mentioned in this Guide. 



6480, Eound Parkes there is a good deal of the volcanic rock 

 known as andesite, which appears, indeed, to be the principal 

 country-rock of this mining district. It is sometimes incorrectly 

 called diorite. 6490 is a block of this rock traversed by quartz 

 veins carrying pyrites, thus illustrating in miniature the occur- 

 rence of the lodes. 



BobadaJi, Nymagee, Oohar, Mount Brysdale. — The Cobar Gold- 

 field is represented by numerous specimens, from a general 

 inspection of which it will be seen that the country-rock is slate. 



