668 THE GEOLOGY OP MINNESOTA. 



[Flint. Schist. Granite. 



The third group becomes more and more coarse and even conglomeratic toward 

 the east, and cannot be distinguished petrographically from the Ogishke(?) conglom- 

 erate, as represented by the following numbers: 1062, 1063, 1064, 1065, 1066, 1080, 

 1095. N. H. w. 



No. 1107. FLINT. 



West side of sec. 27, T. 65-7, on Knife lake, north from the portage landing from Kekecjuabic lake. 

 Ref. Annual Report, xv, pages 381, 398. 



Meg. Purplish to black, weathering light colored. 



Mir. This is apparently a finer debris of the same kind as the tuffs about Keke- 

 quabic lake, but probably of older date. One section. 



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



No. 110H. MICA SCHIST AND GRANITE. 



Basswood lake, at the west end of the portage near the centre of sec. 6, T. 64-10 W. 

 Ref. Annual Report, xv, pages 356, 398. 



Meg. A fine-grained, dark, compact, biotite schist cut by a vein about an inch 

 in width, of medium-grained, pinkish, muscovite granite. No. section. 



.\(j<>. Archean. u. s. G. 



No. 1109. QUARTZ-FELDSPAR SCHIST. 



At the portage from Newton lake to Pall lake. 



Ref. Annual Report, xv, pages 356, 398 ; Annual Report, xvii, pages 198, 206. 



Meg. "Sericitic" schist. 



Mic. There is but little sericite in the slide, but there is a very finely granular 

 background of secondary quartz and feldspar, in which are very sparsely distributed 

 larger grains of quartz, adinolite and areas of calcite. One section. 



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



No. 1110. GRANITE. 



From the island in White Iron lake, lying in sec. 33, T. 63-11, and sec. 5, T. 62-11. 

 Ref. Annual Report, xv, pages 330, 398. 



Meg. Quartzose granite, rather coarse. 



Mic. A finely striated feldspar has an extinction on ?i p of 81, a feldspar between 

 audesine oligoclase and oligodase, some have no twinning, orthoclase, and some have 

 the quadrillage of minwline. The ferromagnesian mineral is lionihlnnlr. There are 

 a few grains of .^>licn<'. In some of the feldspars is much zoisite in rather coarse 

 crystalline grains. One section. 



Age. Archean granite. N> H . W- 



No. 1115. ACTINOLITE SCHIST. 



NViir the north end of White Iron lake 



Ref. Annual Report, xv, pages :J30, 398 ; Bulletin vi, page 8. 



