BY W. H. BRYAN, B.SC, 147 



Crrubenmann's classification.' Their general strike is north- 

 west, with a varying dip to the north-east. The age of 

 the schi.sts has long been a matter for considerable specula- 

 tion, as even where not highly foliated, they appear to be 

 entirely unfossiliferous. The series has at different times 

 beeu assigned to the following periods : — Pre-Cambrian,^ 

 Cambrian-Devonian, 3 Silurian,* Devonian^ and Permo- 

 Carboniferous,^ while at present it is classified by the 

 Queensland Geological Survey as Devonian.'^ This 

 classification is, however, admittedly only provisional, 

 no conclusive evidence having as yet come to light. 



V. — The Granites. 



Location, etc. — The rocks considered under this 

 heading form three distinct outcrops. The largest of these 

 is roughly oval in plan, and lies between Kedron Brook 

 on the north. Mt. Cootha Reserve on the south, the Enoggera 

 Reservoir on the west, and the Enoggera Rifle Range on the 

 east. The longer axis of the oval lies in a direction N. 12° W. 

 — S. 12^ E.. and measures four and a quarter miles, while 

 the shorter axis is about two and three-quarter miles long. 

 This principal outcrop is spoken of throughout the paper 

 as ■' the Enoggera Area." About one and a quarter miles 

 south of this occurrence, and roughly one and a-half miles 

 west-north-west of' Indooroopilly railway station, lies the 

 second outcrop. This is sub-circular in shape, with an 

 average diameter of about 750 yards. This may be 

 conveniently termed the " Green Hill Area " since it lies 

 adjacent to a hill of that name. Lying to the north -north- 

 east of the Enoggera Area, and distant from it 

 one half-mile, and one and a-half miles I'espectively, 

 are two further outcrops of granitic rock. They are 



1. l^. Grubenmann, Die Kristallineu Schiefer. 



2. R. A. Wearne, A.A.A.S., 1911. 



3. H. J. Jensen, Proc. Royal Soc. of Qld. XXIII, p. 154. 



4. William H. Rands, Op. cit. p. 1. 



5. Sir A. C. Gregory, Report on Geological Features of S.E. Districts 

 of Qld., 1879. 



6. Q'land Geological Survey Map. 



7. B. Dunstan, Queensland Mineral Index, Geological Survey, 

 Queensland. Pub. No. 241, p. 144. 



