PETROGRAPHIC GEOLOGY AND DESCRIPTIONS. 665 



Granite. Tuff. Bstorcllyte.] 



Mey. Similar to the last, but greenish. 



Mic. This rock, like the last, contains numerous old feldspars much twinned, 

 with lagged edges, eaten into by a secondary micro-granulitic development of fresh 

 '/ nail z and feldspars. Some of the old feldspars are almost entirely replaced by this 

 new generation. The hornblende is somewhat brown in pleochroism, parallel to 

 and bluish parallel to n,. The rock also has a few grains of sphene and scattered 

 magnetite, and also pi/iuroie and calcite. One section. 



Age. Archean (Keewatin). N. H. w. 



No. 1102. GRANITE. 



West end of Animikie island in Kekequabic lake. S. W. 14 N. E. % sec. 3, T. 64-7 W. 

 Ref. Annual Report, xv, pages 362, 398. 



Meg. "Greenish syenyte identical with No. 1101." No specimen found. No 

 section. 



Ay i'. Archean (Keewatin). u. s. G. 



No. 1103. GRANITE. 



Northwest corner of Animikie island in Kekequabic lake. S. W. J^ S. W. ^ sec. 3, T. 64-7 W. 

 Ref. Annual Report, xv, pages 362, 398. 



Meg. A reddish and a gray specimen, the former quite similar to Nos. 1101 

 and 1102. In one place a breccia is apparent, the gray holding fragments of the red. 



No section. 



Aye. Archean (Keewatin). u. s. o. 



No. 1104. TUFF. ( tiubgranitic. ) 



East end of the largest or Animikie island, Kekequabic lake. 

 Ref. Annual Report, xv, pages 362, 398. 



Meg. Green and diabasic in aspect, rather fine grained. 



Mic. This fine-grained rock contains numerous fragments of feldspar, most of 

 them very small and apparently of secondary date, but some of them old; hornblende 

 in subordinate amount, also in mesh-like arrangement, and biotite. The last occurs 

 both in the fine interlocked groundmass and in the body of the larger grains of 

 feldspar. The slide also contains patches of rock, which varies from the rock of the 

 slide, by being finer grained, or free from hornblende, but micro-granulitic with 

 tVldspar. Sphene and magnetite as in No. 1101. One section. 



Age. Archean (Keewatin). N. H. w. 



NO. 1105. ESTERELI.YTE (or Ducijh'). 



From the north side of the little island northeast of Animikie island, sec. 2, T. 64-7, Kekequabic 

 Kef. Annual Report, xv, pages .'5f3, 398; Annual Report, xvi, page 104. 



Meg. Apparently porphyritic, siliceous. 



