GEOLOGY AND PETROLOGY OF ENOGGERA GRANITE. 123 



Geology and Petrology of the Enoggera 

 Granite and the Allied Intrusives. 



By W. H. Bry'an, M.Sc, Lecturer in Geology, 

 The University of Queensland. 



PART 11.— PETROLOGY. 



(Plates I.-III.) 



{Bead before the Soyal Society of Queensland, 2Gth June, 1922.) 



1. Introductory. 

 II. General Petrology. 



III. Petrography — 



(a) The Pink Phase; 



(&) The Grey Phase; 



(c) The (?) Hybrid Rock; 



(d) The Rhyolitic Intrusives: 



(e) The Porphyritic Intrusives. 



IV. Comparison with rocks of other areas — 



(a) New England and Stanthorpe; 

 (h) Other Queensland areas. 



V. Economic. 



I. INTRODUCTORY. 

 In November, 1914, the author had the privilege of 

 reading before this Society the first part of a paper entitled 

 "Geology and Petrology of the Enoggera Granite and the 

 Allied Intrusives."^ This dealt with the general geology 

 of the area, and it was the author's hope that it w^ould be 

 followed, after a short interval, by the second part of the 

 paper, which was to deal more particularly with the Petro- 

 logy. Much of the work required for this part of the paper 

 had been done, but its publication has been very much 

 delayed, chiefly as the result of the author's absence abroad 

 with the Australian Imperial Forces. 



^ Proe. Eoyal Soc. Qld. Vol. XXVI. p. 141. 



