PETROGRAPHIC GEOLOGY AND DESCRIPTIONS. 753 



Quartzyte. ( 'im^lomrrate.] 



secondary interlocking quartz, of varying fineness, but which, in common light, 

 reveals a taconitic structure with ni<i</netit<>, some limonite, the latter being yellowish 

 red, often staining actiii<ilitc( ?) so that it is opaque. H. With a more or less broken 

 taconitic structure and fine interlocking quart/, is a considerable amount of glau- 

 conite, so-called, and of rusty and green pleochroic cli/oi-i/r as well as (apparently) 

 adinolitc, some powder of magnetite, and numerous rhombs and irregular grains of 

 siderite, the last being stained sometimes to a light yellow by ox ida lion. The siderite 

 lies in the glauconite, and also within the rusty chlorite. The glauconite is mingled 

 intimately with the iron-stained elements, but usually maintains its distinctness and 

 its color. The chlorite is apt to be stained by iron. When it appears in slender 

 spicules it can be seen to be partly green and partly rusty, the green color being 

 apparent when, on rotation over the polarizer, it is brought into coincidence with 

 the principal section of the polarizer. When perpendicular to it the rusty color only 

 is visible. The glauconite itself appears to be a mass of finer scales of chlorite. 

 Three sections. 



. Age. Animikie. N. n. w. 



No. Hi.'i-l. CONGLOMERATE. 



No. 8 of the drill at Wicks'. 



Rf.f. Annual Report, xxi, pn^cs S.'i Hfi, I ">.'!; Annual Krport, xxii, page 100. 



Mr;/. "Greenstone" materials, embracing many pebbles and grains of quartz. 



Mir. The quart/ grains are the most conspicuous and important element. 

 They are. not altogether rounded, and are sometimes occupied by several interlocking 

 orientations, with also many minute inclusions. They are embraced primarily in a 

 fine ground mass of interlocking quartz. This groundmass of interlocking quart/ 

 varies in fineness and appears pebbly, /. r., it, is in pebble-like areas, as if it depended 

 on old feldspars which it had permeated and replaced. Mixed irregularly throughout 

 the whole is much green dichroic chlorite in fine grains and shreds. This is 

 frequently compart, scaly, and then resembles the //Inncimili', which has been noted at 

 this stratigraphic horizon many times. It is disposed in somewha.l angular and sub- 

 rounded areas, but not so as to show the taconitic, structure. Its arrangement seems 

 to be dependent on that of the coarser grains of quart/, etc., occupying the spaces 

 between them. In one of the, slides the pebbly appearance of the areas of inter- 

 locking quart/ isquite marked, and resembles that seen in the Ogishke conglomerate, 

 and in some of the fragmental rocks about Kekequabic lake, where the pebbly aspect 

 was found to be due to replacement of old feldspars which formed constituent parts 

 of the original conglomerate. Three sections. 

 Animikie (1'okegama). 



4!) 



