﻿456 



PKOF. E. W. SWEATS ON THE GNEISSES 



[Aug. 1 910, 



Fig. 2. — Diagrammatic section (A on the map. Jig. l,p. ^5%) from 

 south-east of Upiuay, showing the relations of the clacite and 

 altered dacite to the granodiorite. 



M on bulk Creek 



D a'c i t e"; 



+ + + 



+ + 



+ + 



:s> 





.'•6.- 



r + ' • T + ' -I- ' ^ + ■ 



- + + 4- G rano diorite . + 



^ 



Fig. 3. — Diagrammatic section (B on ^7te m«p, fig. 1, p. 452) from 

 south of Upway, showing the relations of the dacite, altered 

 dacite, gneissic rocks (Grn.), and granodiorite. 



M on bulk Creek 



+ T 

 + + + 



- + + + 



+ + + + 



+ + + + + + + 



y + + + ++ + %+ + 

 + ^+ + + „t + . + + + 



+ Granodiorite + 



. + + .- + + + + J +-^ + 



+ 4- 

 + 



there is no tendency towards a schistose structure in this rock ; and, 

 apart from a slight undulose extinction in some of the quartz, no 

 evidence of strain is observed under the microscope. 



