PETROGRAPHIC GEOLOGY AND DESCRIPTIONS. 645 



Graywacke. Green schist. Vein rock.] 



No. 1054. GRAYWACKE. 



Same locality as No. 1053. 



Ref. Annual Report, xv, pages 365, 395. 



Meg. Very similar to the first sample mentioned under No. 1053. No section. 

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



No. 1055. GREEN SCHIST. (Tuff.) 



Kekequabio lake, northwest end of the bay projecting northward into sec. 34, T. 65-7. 

 Ref. Annual Report, xv, pages 365, 395, 396. 



Meg. Lenticularly and coarsely schistose; the northwest extension of rocks 

 Nos. 1049 and 1050. 



Mir. A mass of fine debris of the kind represented by rocks Nos. 1049 and 1050, 

 largely hornblendic, but cemented by calcite and by secondary deposition. Carlsbad 

 and albite twinned fragments of feldspar are visible and a little quartz in indepen- 

 dent grains, evidently a part of the original debris. The section is remarkable for 

 the amount of contained calcite. One (thick) section. 



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



No. 1056. VEIN ROCK. 



Same locality as No. 10.V>. 



Ref. Annual Report, xv, pages 365, 395. 



Meg. From veins in No. 1055. The hand sample consists largely of milky 

 white quartz and pinkish calcite. No section. 



Aye. Archean. u. s. G. 



No. 1057. GREEN SCHIST. (Tuff.) 



Near the meander corner between sees. 35 and 36, T. 65-7. 

 Ref. Annual Report, xv, pages 365, 395. 



Meg. Variety of No. 1055, non-schistose nor pebbly. 



Mic. This is like No. 1055 in composition, but the hornblendes are coarse and 

 more like those of Nos. 1049, 1050, etc., with a little feldspar debris. One section. 

 Age. Archean. N. H. w. 



No. 105H. GREEN SCHIST. (Tuff. ) 



From the hill in N. W. % sec. 36, T. Go -7 ; Kekequabic lake. 

 Ref. Annual Report, xv, pages 366, 368, 395. 



Met/. Sometimes conglomeratic, butdn general resembling the last. Two speci- 

 mens were obtained, one showing the conglomeratic structure and the other a hard, 

 coarse-jointed, sometimes schistose, rock. 



Mir. The section is made up of a debris like the last, but composed largely of 

 /turtthleitt/en, which were probably originally augite fragments. They are short and 

 angular without fibrous enlargements. The fine-grained matrix is composed of the 

 same materials. One section. 



Aye. Archean (Upper Keewatin). N. H. w. 



