114 VOLCANIC AREA OF EAST MORETO.V, ETC., DISTRICTS, Q,, 



The yellow, highly folded, phyllites met with west of Cabool- 

 ture at Wararba, on the Woodford and Mt. Mee Roads, are only 

 slightly metamorphosed. A small quantity of secondary mica is 

 developed in them; otherwise their characters are those of a shale. 

 These rocks are penetrated with quartz veins, and belong to the 

 Gympie Series. Shaly Phyllite seems the most suitable name. 



Many of the puzzling rocks met with in the Kin-Kin country 

 and in the Eumundi railway cuttings were sectioned and 

 examined. 



Sp. No.113. Clay Shale. Loc: Road cutting on the Cooran to 

 Kin- Kin Road. 



i. Handspecimens vary in colour from pink to purplish. Yellow, 

 grey and bluish varieties are also met with. The rock is 

 extremely fissile, and has a greasy feel like a talcose or steatitic 

 schist. It is highly folded and traversed by quartzy veins. 

 Before the blowpipe it gives the smell of burning organic matter, 

 and the powdered rock gives no Mg. reaction, but a very strong 

 aluminium reaction, with cobalt nitrate. 



ii. Under the microscope it is found to be almost wholly 

 isotropic, and therefore it is probably made up mainly of 

 amorphous muddy material. A considerable amount of iron 

 staining is present. 



Sp. No.200. Chocolate Shale. Loc : Eumundi Railway cuttings. 



i. In handspecimen a soft chocolate-coloured, highly fissile 

 rock with slat}' cleavage; it is not unlike the Kin-Kin shale, but 

 is less folded, and the quartz veins found in it appear to bear 

 some relation to the rhyolite dykes. The pressure causing the 

 cleavage was probably lateral, induced by earth-movements con- 

 nected with volcanic action and the intrusion of dykes. 



ii. Under the microscope it has the appearance of a tuffaceous 

 clay shale. It seems to be composed essentially of comminuted 

 felspar, hornblende, chlorite and isotropic material. 



Sp. No.201. Black Slaty Shale. Loc: Eumundi-Cooroy Railway 

 cuttings. 



Handspecimen like slate. It cleaves into very thin sheets. 



