234 



DESCRIPTIVE 



CATALOGUE 



228. Dolerite — colour, dark greenish gray ; minutely crystalline. Traverses 

 No. 227. 



229. Metamorphosed shales — very calcareous ; colour, gray; thinly laminated; 

 light specific gravity ; granular ; contorted. When highly metamorphosed, present 

 a quartzose appearance. 



230. Greenstone. 



231. Metamorphosed red sandstone — from fragments enclosed in No. 230. 



232. 233, 234. Metamorphosed siliceous and siliceo-argillaceous shales — of every 

 grade, from the " Palisade" rock, No. 251, to a light reddish blue and gray rock, 

 little altered. Some are heavy, compact, and fine-grained ; others are light aud 

 granular ; and one variety bears great resemblance to roestone. Some of the beds 

 contain very perfect crystals of Labrador felspar. 



235. Basaltic rock — dark-coloured, almost black. A few very minute crystalline 

 points to be seen. 



236. Red sandstone — fine-grained; fine lines of deposition. 



237. Red sandstone — pebbly ; the pebbles from the size of bird-shot to half an 

 inch in diameter, all water-worn, rounded, and smooth. 



238. Basaltic rock — fine-grained ; homogeneous ; smooth fracture ; colour, dark 

 purplish gray. 



239. Coarse grains of felspar, the size of peas, with a few crystals of larger di- 

 mensions, cemented by a paste of dirty reddish-white felspar. Colour, greenish 

 gray. Shows lines of stratification. Appears to have been derived from the disin- 

 tegration of Amphodelite rock, No. 148. 



240. A variety of greenstone — composed, principally, of hornblende and felspar ; 

 coarsely crystalline, with a few crystals of white felspar disseminated through it, 

 which gives it a porphyritic appearance. 



241. Greenstone — minutely crystalline. 



242. Same as No. 195. Siliceous shale; colour, light purplish gray; some thin 

 white bands of sandy material ; a few white spots, which penetrate the rock per- 

 pendicularly ; very fine-grained ; fracture smooth, the perpendicular one even, the 

 horizontal one, in the thicker layers, conchoidal. 



243. Same as No. 242 — with thin partings of quartz-sand. 



244. Metamorphosed argillo-siliceous shale — colour, red, like a half-burnt brick; 

 the lamination discoverable, but nearly obliterated. Tolerably large grains of quartz 

 disseminated through it. Not so highly metamorphosed as the rock underlying the 

 " Great Palisades," but belongs to the same beds. 



245. 246. Coarse siliceous shale — becomes coarsely granular, and then pebbly, 

 and finally merges into a coarse conglomerate, with many large pebbles of Nos. 242 

 and 243, from half an inch to three inches in diameter. The shaly, pebbly portion 

 is of a purple colour, thinly laminated, and full of zeolites between the laminse and 

 in the joints ; and has small veins or strings of laumonite ramifying through it in 

 all directions. It bears a great resemblance to the shale-beds intercalated with 

 the upper conglomerate of St. Louis River. 



247. Dolerite — colour, dark greenish gray ; disposed to be prismatic at some 

 points. 



