META5I0RPHIC ROCKS OF S.E. QUEENSLAND. 261 



fact is a strong indication that the true Gympie rocks are newer than 

 the others, and have never been dragged down into the zone of 

 «chistosity and earth tlowage. 



East of G}axipie beyond the Inglewood dyke the white, yellow, 

 and purple phyllites occur. These ai^e much more schistose than the 

 ti-ue Gympie rocks, and much more contorted. • They appear to have 

 been at some time or other in the zone of flowage. At Deep Creek 

 they have assumed a facies exactly like that of the Kin-Kin schists 

 on the southern side of the ±Jeenam-Woondum Eange. From my 

 latest observations I have come to the conclusion that I was wrong 

 in considering the Kin-Kin phyilites newer than Gympie. I now be- 

 lieve them to be older. 



In the Beenani llange, near Noosa Vale, the true Gympie rocks 

 appear again. Here they have been intruded by pyritous hornblende- 

 biotite-tonalite. - 



The Woondum Tableland (Mother Mountain) consists of veiy old 

 gneissic granites and red granites, Kin-Kin phyllites, and tonahtes of 

 Post-Gympie age, with cappings of tertiary basalt. 



The Gympie rocks appear to overlie the Kin-Kin phyllites, and 

 at Gympie they seem to lie in a trough. They consist principally of 

 subaqueous tuffs, breccias, and lavas, which have been meta- 

 soraatised by silicifving ascending waters. The estuarine situation of 

 the area at the time of deposition is shown by the fossils and the 

 plumbago. The Gympie fossils consist of a mixture of the Car- 

 boniferous and Permo-Carboniferous types of New South Wales, wivii 

 a particularly strong leaning towards the Permo-Carboniferous. i-'h..- 

 plumbago probably represents metamoi'phosed plant beds 



For the following reasons it seems likely that the true Gjinpie is 

 equivalent to the Permo-Carboniferous of New South Wales : — 



(1) The Late Carboniferous and Perrao-Cai'boniferous being noted 

 for a cooling of terrestrial climate, it is likely that animal 

 and plant species migrated towards the tropics, and many 

 New South Wales Carboniferous species might in Queens- 

 land have existed until well into Permo-Carboniferous 

 times. 



(2) Boulders of glacial deposition are reported to have been 



found in the Gympie mining field, and these occur in a 

 bed probably equivalent to the Branxton horizon of New 

 South Wales. 



(3) The fossils consist mainly of Permo-Carboniferous types. 

 True Gympie i-ocks occur, in addition to the type locality, at 



Chinaman Creek and Walli Creek west of the Blackall Range, occupy- 

 ing there a circular area about seven or eight miles in diameter. Here 

 the same fossil beds, the same kind of slates and black- rock, the same 

 types of purple and green conglomerate (agglomerate) occur in ap- 

 parently the same order. This locality differs only from Gympie in 

 the absence of the great abundance of andesitic and poi-phyritic 

 (greenstone) dykes and in the rarity of quartz reefs. On the other 

 hand numerous dykes of well-presei-ved granite and diorite traverse 

 the Gympie beds here. Amphil)olite dykes must also occur, as I have 

 found specimens of this rock in the creek beds. True Gympie slates 

 also seem to occur at Wararba and the foothills of Mount Mee. The 

 slates here are, however, more fissile and may be older. 



