264 • PROCEEDINGS OF SECTION C. 



We see that numerous rocks are represented which must be 

 either of extremely old age or must have been depressed to extremely 

 deep horizons during great earth- folding processes ; these earth-folding 

 processes must have been of such intensity and magnitude that we 

 know with certainty, from the feeble wrinkling of the true Gympie 

 beds in type areas, that they antedate the Gympie period. 



Personally I hope that I may have an opportunity to carry 

 through an investigation of these interesting rocks, but if no oppor- 

 tunity occur to me, it is a work which I should like to see taken up 

 by anybody with the determination and capacity to execute it well. 

 It is a badly-wanted piece of research, and one which will amply 

 repay one for the trouble. It would solve many problems in Queens- 

 land geology which the geologists of the past have only played with. 



6. Glaucophane Schists. — These interesting rocks occur at Mount 

 Mee, Leacy's Creek, and on the Mary River slopes of the Conondale 

 Range. As I have already described their occurrence, chemical, and 

 mineralogical composition in two papers, " The Geology of the East 

 Moreton, &c." (Proc. Linn., N.S.W., 1906, Part 1), and '•Chemical Note 

 on a Glaucophane Schist from the Conondale Range" (Proc. Linn., 

 N.S.W.), I willnot repeat myself in this respect. However, there is this 

 fact to emphasise^ — namely, that these rocks are altered tuflEs and 

 lavas which have been metamoi-phosed in the middle zone or the 

 lowest portion of the upper zone. They occur in other parts of the 

 world only in the oldest metamorphic (chiefly Archaean) formations, 

 and thus lend further support to the idea that many of the so called 

 Gympie rocks antedate that age by many periods. 



7. Economics. — Gold: Payable reef gold in the area which I 

 have traversed occurs only at Gympie. The best prospects of finding 

 undiscovered gold reefs are in the region of the Upper Mary River, 

 particularly in the wedge of country between the Obi-Obi River, the 

 Mary River, and the Blackall Range. Also in the Jimna Ranges west 

 of the Mary River. This country is very little explored and covered 

 with dense scrub, which proves a serious obstacle to prospectors. 

 Copper : This metal occurs in its various forms scattered far and wide 

 through the metamorphic formations, but has not yet been met with 

 ill payable quantities. Usually one finds it in quartz reefs and leaders 

 in the form of copper pyrites carrying a gossan cap of green and 

 blue carbonates. It is generally more or less auriferous. Such veins 

 occur at Wararba, Kilcoy, Walli Creek, and many otlier places. 

 Copper in traces is also obtained in some of the basaltic lavas of the 

 Blackall Range. It has probably been assimilated at a depth. 

 Manganese (cobalt and nickel) : Good deposits of cobaltiferous wad 

 are loiown both in the D'Aguilar Range and in the Gympie district at 

 Pie Creek. Carriage cost is to-day the stumbling block in the way of 

 profitable mining. Nickel occurs as a rock-forming constituent far 

 and wide. In the metamorphic glaucophane schist and serpentine 

 areas of the DAguilar and Mount Crosby Ranges, so similar petrolo- 

 gically to New Caledonia, nickel may yet be found. The dense scnibs 

 may have hidden many valuable ore deposits. Iron: Considerable 

 ironstone beds occur in the Trias-Jura formations near Mooloolah 

 Heads ; also in other places. Coal and clay : Coal and good brick, 

 pottery, and fireclays occur abundantly in the Trias- Jura, and are 



