Ill the above list we have a fairly representative collection, with a decided pre- 
ponderance of Middle Devonian forms. It will be seen that not a single fossil hitherto 
collected is specifically identical with any which are known in the Permo-Cai-boniferous 
Jstem. Three genera of Actinozoa, viz., Favosites, Faclii/pora, and Cyatliopliylhi-m, 
t\yo of Brachiopoda, viz., Spirifera and Fh/nclwnella, are, however, repeated in the 
J'Bipio Pormation ; and the two Brachiopods above named are also repeated in the 
tar lormation. Spirifera alone survives in the Middle Bowen Pormation. 
I ho Queensland Devonian may be fairly placed on the same horizon as the 
Middle Devonian Limestones of Bindi and Buchan, Victoria,* and is probably on a 
|ower horizon than the Upper Devonian of Tynana Creek, Victoria. My Colleague 
]^orms me that the Lower Devonian ago a.scribed to various rocks in New bouth 
Wales is doubtful, and that all the fossils from these rocks which have come under his 
Kotjce are now believed to be Upper Silurian. 
mines in connection with the middle devonian rocks. 
ARGENTINK SILVER FIELD. 
The argentiferous lead lodes of the Argentine Field occur partly in granite 
oun ly and partly among bighly inclined micaceous clay-slates, mica-schists, and 
gneisses. Regarding the ago of the sedimentary rocks above referred to, no distinct 
ence has yet been brought to light, but from their position between the Broken 
^ iver and Reid, they may be supposed to be continuous with the Middle Devonian 
s of these districts. A thick series of white sandstones, pebbly grits, and 
omeratea, probably identical with the lower portion of the Star Formation, lies 
ncou ormably on the slates, &c., or rests on the granite. 
field has been in existence since 1881. The lodes, especially those in the 
eountry, oiler every indication of richness and permanence ; fuel and 
0 ^^*!°^*^ ironstone for fluxing are- abundant and conveniently situated. In spite 
of th advantages, prosperity has hardly yet dawned on the field. The majority 
1 .® ^°fics were originally secured as freeholds under the old Mineral Lands Act, the 
the b*^^* for a time of a very perfunctory nature ^and having for their object 
^ 6 . fulfilment of the “ improvement conditions,” or the raising of sufficient 
on ^^**1™** induce outsiders to purchase the miues, Some of the mines, worked 
sen^ man’s” scale, have obviously failed through the mechanical difficulty of 
sarthy low-grade oxide and carbonate ores from the almost equally heavy 
Saugue-stnffi without dressing machinery 
and a severe blow, destroying as it did confidence in the value of the mines, 
have about their almost complete desertion. The Hero and Northbrook Mine,? 
The failure of the smelting 
'Sj which were erected pi-einaturel}^ before sufficient quantities of ore were ready 
from T steadily worked at a profit for some years, the ores being shijjped 
ovvnsville. Ihe Hero has recently been taken up by a Sydney company, 
part f fi® surface ores, which have alone been raised hitherto, consist for the most 
Sam i° carbonates, sulphates, and sulphides of lead. The silver contents of 
but^ which I have assayed average generally about 1^ oz. per ton to the unit of lead, 
reach 5 oz. of silver to the unit. In other words, a ton of galena ore 
^®^fi might contain from 75 oz. to 300 oz. of silver, 
silv ■^“®‘'®_cuu be no doubt that this field will yet take a high place among the 
er-producing localities of Australia. 
AuthorUy f “tlggPliysical Geography of Victoria, by Reginald A. F. Murray. Melbourne : by 
