20 
In the neighbourhood of Clermont a scries of gold and copper -hearing schists, 
slates, quartzites, &c.,is apparently orerlaid unconformahly by a bed of limestone of 
Devonian age. * 
111 many other localities, stratified roclcs, belonging to formations newer than the 
Devonian, rest unconformahly on upturned strata which arc more or less metamorphosed, 
but, beyond tlie superposition of the newer formations referred to, there is nothing to 
indicate the age of the upturned rocks in the absence of palaeontological evidence. 
The whole of the strata classed as “ undetermined,” consisting originally of lime- 
stones, conglomerates, sihecous and felspathie sandstones, clay shales and mudstones, 
are generally thrown into sharp folds, and are often locally metamorphosed into marbles, 
quartzites, greywackes, mica- and talc-schists, lydian stone, &e. ; or, still further, to 
the utter obliteration of their originally stratified character, into serpentines, diorites, 
hornblende- and tourmaline-gneisses, porphyries, granites, &c. 
In succeeding chapters it will be seen that Daintree and other geologists ascribed 
large areas of these metamorphic rocks to the Silurian and Devonian, chiefly on the 
ground of their lithological resemblance to the strata of these formations as developed 
in Victoria and Ivew South Wales. In regions so far distant I cannot attach any 
importance whatever to evidence of this nature. 
It is impossible to hazard even a guess as to the total thickness of the meta- 
morphosed strata on which “ no name ” has been inscribed. Mr. Bands estimatest the 
thickness of the metamorphic schists and quartzites of the Cape Gold Pield alone at 
from five and a-half to six miles. 
It is to be hoped that all the rocks now mapped as “ of undetermined age ” will 
be relegated to their proper horizons by future observers, and it is more than likely that 
the greater portion will be distributed between the Permo-Carboniferous and Devonian. 
Possibly representatives of some of the older Paleozoic formations which, so far as we 
know, are absent from Queensland, may yet be detected among the more or less meta- 
morphosed strata. It may be suspected that the limited areas of metamorphic rocks in 
the south-western corner of the Colony are a prolongation of the Cambrian rocks of 
South Australia and the north-western portion of Hew South Wales.J 
We have not as yet been able to recognise in Queensland by direct evidence any 
equivalents for the Cambrian of Torke’s Peninsula, South Australia, nor for the 
Graptolite-schists of Victoria, nor for the Dpper Silurian limestones of Tass and 
Downing, New South Wales, and of Lancefield, &c., and the Upper Tarra Basin in 
Victoria. 
It would be beyond the scope of this work to attempt to give a detailed descrip- 
tion of the metamorphic rocks of Queensland. Such descriptions wdll be found in 
overw'helming detail in the voluminous writings of Stutchbury, Aplin, Daintree, 
Gregory, and the officers of the present Geological Survey. 
MINES IN CONNECTION WITH METAMOEPHIC EOCZS OE 
UNDETEEMINED AGE. 
CLONCUEEY GOLD AND COrPEE FIELDS AND McKINLAY GOLD FIELD. 
The greater part of this extensive area is covered by highly inclined slates, 
quartzites, and greywackes, with occasionally a bed of limestone. These have so far 
])roved unfossiliferous, and there is no distinct evidence of their age. These rocks form, 
* Report on the Gnology and Mineral Deiiosita of the Country in the Vicinity of Clermont. W. H. 
Rands. Rrisbane : by Authority : l8S(j. ISce also Chaxiter VIII. 
f Reyiort on the Caiio River Gold Field. Brisbane : by Authority : 1891. 
X Is it possible that some these beds of undetermined age may also represent the Azoic rocks of 
South Australia, below the Cambrian?— R.i/. junr. 
