PETROQRAPHIC GEOLOGY AND DESCRIPTIONS. 615 



Granite. Mica schist. Pegmatyte.] 



Meg. A medium-grained, reddish, hornblende granite. 



Mic. A granite, composed essentially of feldspar, quartz and hornblende, which 

 last is largely replaced by biotite and chlorite. 

 One section. 

 Age. Archean. u. s. o. 



No. 964A. GRANITE. (BioUtic.) 



See under No. 964. 



Ref. Annual Report, xv, pages 334, .335, 391. 



Meg, A rather fine-grained, pinkish, biotite granite. 



Mic. An ordinary granite, the essential minerals being quartz, feldspar and 

 biotite. 



One section. 



Age. Archean. u. s. G. 



No. 964B. MICA SCHIST.' 



See under No. 964. 



Ref. Annual Report, xv, pages 334, 391. 



Meg. Hand specimen not found. No section. 



Age. Archean. u. s. G. 



No. 965. GRANITE. ( Biotitic. ) 



" Rock No. 965 is fine-grained granite, in bedded regular dip E. 30. No. 965A is from a vein (or dike) of 

 coarse syenyte running zigzag in No. 965." Same place as No. 964. 

 Ref. Annual Report, xv, pages a34, 335, 391. 







Meg. A fine-grained, gray, biotite granite. 



Mic. A granitic aggregate essentially of feldspar (considerably clouded), quartz 

 and biotite. One section. 



Age. Archean. u. s. G. 



No. 965A. PEGMATYTE. 



See under No. 965. 



Ref. Annual Report, xv, pages a35, 391. 



Meg. A coarse-grained aggregate of quartz and pinkish feldspar. 

 Mic. Quartz and feldspar, the latter commonly showing fine albite twinnings. 

 One section. 



Age. Archean. u. s. G. 



No. 966. GRANITE. 



Same place as No. 964. 



Ref. Annual Report, xv, pages 335, 391. 



Meg. Rather coarse-grained granite composed of quartz, white, pinkish and red 

 feldspar and apparently both hornblende and biotite. 



