PBTROGRAPHIC GEOLOGY AND DESCRIPTIONS. 649 



Feldspar. Graywaeke. Conglomerate.] 



interferences amongst themselves, is a feature which is more like albite, but is not 

 probably a reliable character as diagnostic, but is a marked feature of the feldspar 

 (andesine) of esterellyte, as described by Michel Levy. Two sections. 



Age. Archean (Upper Keewatin). 



Remark. This conglomerate is made up of pebbles of various grain, as to size, 

 and of the above debris. Microscopically the sections of No. 1061, from Kekequabic 

 lake are indistinguishable from this. This is supposed to be the conglomerate which 

 spreads widely eastward, under the name Ogishke conglomerate, and, according 

 to Dr. Grant, it extends also westward to the south shore of Kekequabic lake. 

 (Annual Report xxi, page 27.) N. H. w. 



No. 1062A. FELDSPAR. 



Same locality as No. 1062. . 



Ref. Annual Report, xv, page 396. 



Me(j. Part of No. 1062, coated with a thin layer of small, pinkish crystals, 

 probably orthoclase. No section. 



Age. Archean. u. s. G. 



No. 1063. GKAYWACKE. ( Comylomeratic. ) 



N. W. ^ sec. 27, T. 65-6; northwest shore of the long bay from Ogishke Muncie lake. 

 Ref. Annual Report, xv, pages 369, 396. 



Meg. Appearing conglomeratic and quartzose. 



Mic. The greater part, by far, of the slide, consists of clouded feldspars, in 

 which kaolinic and chloritic substances combine. There are some sub-rounded 

 grains of quartz, some calcite, a little distinct hornblende and apparently considerable 

 leucoxene. One section. 



Aye. Archean (Upper Keewatin). 



Remark. This is a compact debris, rather coarser in average than the foregoing, 

 and perhaps is more dependent on oceanic assortment, but in general it is a very 

 similar rock, though the elements were more decayed prior to consolidation into the 

 present rock mass. It is probable that much of the debris of this rock was of volcanic 

 origin primarily. The feldspars rarely come into contact, at least they never 

 interfere. N. H. w. 



No. 1064. CONGLOMERATE. 



Shore of the bay last mentioned; taken so as to represent the average character of the rock about this bay. 

 Ref. Annual Report, xv, pages 370, 396. 



Mey. Conglomerate, showing among the enclosed pebbles some of red jasper 

 and of quartz. 



Mic. Identical with the last in general character, but showing a few well- 

 preserved hornblendes, though the most of the debris of the ferro-magnesian minerals 



