236 



D E S C It I P T I V E 0 A T ALOGU E 



263. Belongs to the same series as No. 262, but was derived from more earthy 

 beds. Resembles hornstone at some localities, and quartzite at others. Thin edges 

 of small fragments translucent. 



264. A still more earthy bed of No. 262 — very amygdaloidal ; cells small, oval, 

 and filled with zeolites and calcareous spar. Colour, purplish red. 



265. Greenstone — colour, dark gray, nearly black ; crystalline; the hornblende 

 predominating. 



266. Siliceous shale — same as Nos. 195 and 242 ; altered, but bearing all the 

 characteristics of those rocks. 



267. Same as No. 266 — highly metamorphosed. Some of the beds are very com- 

 pact, highly crystalline, and of a pinkish-gray colour, resembling, in general aspect, 

 some of the quartzites, especially in near contact with the trap dike. Occasionally 

 presents the appearance of the top beds of the " Great Palisades," containing small 

 lumps and scales of quartz, which render it porphyritic. 



268. Siliceous shale — quartzose ; colour, gray; somewhat altered; otherwise does 

 not differ from the shales of " Hat Point," below Grand Portage Bay. 



269. Same as No. 268, in all respects. 



270. Same as No. 268, but much metamorphosed. Colour, reddish gray; very 

 hard ; some of the layers flint-like ; in some places, loses its gritty appearance, and 

 has a smooth, even fracture across the lamina?, but is still granular between the 

 layers. It is precisely like the base of the Palisades, except in not being porphy- 

 ritic. 



271. Highly metamorphosed siliceous shale — colour, grayish- red ; fracture smooth 

 in one direction, somewhat splintery in another ; very hard ; has a dull waxy 

 lustre, like pitchstone ; in some places, the rock could not be distinguished in hand 

 specimens from the quartzites of Wisconsin ; in others, it is like jasper. Belongs 

 to the same beds as No. 270. 



272. Anorthite rock — coarsely crystalline ; colour, greenish and greenish white, 

 with some crystals of flesh-coloured felspar. A very few small crystalline frag- 

 ments of hornblende are found in it at some spots. In the forceps, fuses to a white 

 glassy bead full of blebs. 



273. Same as No. 271, in contact with No. 272 — jasperoid. 



274. Greenstone — hornblende predominates; colour, nearly black; coarsely crys- 

 talline. Weathers with a rough surface, the felspar disintegrating fastest. 



275. Syenitic greenstone — a good deal of flesh-coloured felspar in it. Minutely 

 crystalline ; weathers with a tolerably smooth, rusty surface ; fracture rough. 



276. Greenstone — coarsely crystalline; colour, dark greenish gray; contains 

 some patches and strings of flesh-coloured felspar ; weathered surface rough, and 

 rusty-coloured ; the joints filled with magnesian minerals. 



277. A variety of greenstone — composed partly of hornblende, but mostly of 

 felspar, which fuses, in small splinters, to a clear glass (sometimes a blebby one) 

 like 272, but is much more difficult to fuse. Coarsely crystalline ; colour, black 

 and greenish yellow, as one or other constituent prevails. Weathers with a rough 

 surface. 



278. Greenstone — coarsely crystalline ; hornblende predominates; colour black, 



