GEOLOGY AND PETROLOGY OP ENOGGERA GRANITE. 149 



■"Aeid" granite, and probably earlier than the " Basic 

 -Granites, ' ' while Saint-Smith thinks it is much more closely 

 related to the ''Stanthorpe" (Acid) granite, and, indeed 

 "may possibly be a modification of the 'Stanthorpe' 

 granite."^* The Enoggera sequence shown in the third 

 column agrees more closely w^ith Andrews's interpretation 

 on this point, but otherwise the local sequence is remarkably 

 I'lose to both the New England and Stanthorpe records. 



Table II. 



New England (Andrews)!^, 'stanthorpe (Saint-Smith)20 Enoggera (Bryan). 



I ' 



Intermediate to basic dylces 



lUiyolites, Q. porpliyries, por- 

 phyries 



" The Eiiritic Period " 



' Coarse acid granites " 



' Hornblendic, dioritic, and 

 otlier basic granites " 



' Bhie granite " 



'Blue and blacl^ porphyries" 



' (xrey I'elspar porphyry " . . 



Basic dykes often associ- 

 ated with All., Ag., Pb. 

 Zn., Cu. 



Rhyolites, Q. iiorphyries, 

 porphyries, also 



Aplites, greisens and 

 pegmatites ; sandy 

 granite with Sn. Wo., 

 and 31 o. 



Coarse acid " Stanthorpe 

 granite clo.'-.ely associ- 

 ated with porphyrinic 

 sphene granite 



Maryland adairiellite 

 ( = Greymare granite) 



" Blue granite " . . 



"Acid grey f.'lspar por- 

 phyry " 



.\ltered dioritic rock.? 



Rhyolites with Ag.. Ph., 

 Zn., Q. porphyries, por- 

 phyries 



Aplites with little Mo, 

 granophyres and peg- 

 matite.s 



Pinlc phase proper ( = 

 Mountain Camp quartz 

 mica diorite) 



Grey phase 



iVo/e.— The " sphene-diorite porphyry " of Andrews and the " porphyritic splisn 

 granite " of Saint-Smith are one and the same rock. The difference in po3ition reflect 

 a difference of opinion of these authors. 



Although the Pink Phase, the Aplitic, and the 

 Rhyolitic and Porphyritic Intru.sives had their obvious 

 counterparts in the Stanthorpe and New England Series, 

 the "Grey Phase" was not so easily placed, and the author 

 did not (in the earlier part of this work) care to venture 

 an opinion as to the precise position it occupied in these 

 series. Since the publication of Part I., definite evidence 



'^ Op. Cit., p. 18. 



19 " New England Geology" Part IV. Petrology. Rec. Geo!. Surv. N.S.W.. 

 Vol. VIII. pt. 3, p. 106 et. seq. 



20 " Geology and Mineral Resources of the Stanthorps, BiUandt'in, and Wailan- 

 garra Districts." Qld. Geol. i'vr-. Pub. No. 243. 



R.S. 



