240 DESCRIPTIVE CATALOGUE 



338. Metamorphosed sand-rock — colour, brick-red ; tolerably fine-grained ; con- 

 tains small sandstone pebbles ; carbonate of lime, some zeolites, and a great deal 

 of iron-sand. 



339. Amygdaloid — a dark purplish red, earthy rock, full of elongated oval cells ; 

 the cells all pointing in their long diameter, in the same direction, and very much 

 compressed vertically. The cells are mostly filled with laumonite. Probably the 

 same as No. 364. Belongs to the earthy beds of the lower sand-rock series. 



340. A light-coloured calcareous rock — near the igneous rocks becomes cherty, 

 and the fracture splintery ; occurs in patches in No. 339, rather than in beds of any 

 great extent. Resembles No. 414. 



341. Metamorphosed shaly sandstone — colour, brick-red ; fine-grained; tolerably 

 compact ; jointed ; the grains round and cemented by iron, with some calcareous 

 material ; numerous grains of magnetic iron-sand ; occasional small aggregations of 

 laumonite. 



342. Veins — containing argillite and earthy magnesian material, with joints in- 

 crusted with oxide of iron. 



343. Greenstone — colour, dark green, almost black ; minutely crystalline. Con- 

 tains a good deal of yellow iron pyrites, and some prehnite in lumps. 



344. Earthy green carbonate of copper. 



345. Metamorphosed sandstone — very fine-grained; colour, like that of an over- 

 burnt brick ; very compact ; in thin beds ; jointed. 



346. Metamorphosed siliceous and argillaceous shales, alternating with thin beds 

 of basaltic rock. The shales are fine-grained, Avith many grains of chlorite (?) dis- 

 seminated through them ; colour, purplish gray, with a tint of green. Some of the 

 beds are slightly amygdaloidal, the cells containing siliceous minerals. 



347. Basaltic rock — from the beds in No. 346. 



348. Slaty greenstone — colour, dark gray, laminated; jointed; fracture irregular, 

 lumpy. Like some of the shales of Kinechigakwag Creek. 



349. Slaty greenstone — same as No. 348. Merges into dolerite. 



350. Greenstone — colour, greenish gray ; finely crystalline. 



351. Clay ironstone — striped with very thin laminae of a deep blue colour; seams 

 lined with calcareous spar. 



352. Argillaceous slate — same as that of St. Louis River and Pigeon River. 



353. Amygdules, from one to three inches in diameter, containing laumonite ; — 

 from an amygdaloid interposed between Nos. 346 and 347. The laumonite is sur- 

 rounded by a capsule of small quartz crystals, which are united at their intersections 

 by siliceous matter. Calcareous spar is occasionally associated with the laumonite. 



354. Basaltic rock — very fine-grained; colour, grayish black; non-crystalline; 

 homogeneous ; has a rough, irregular, nodular fracture. In some spots, contains 

 very minute grains of a green mineral. Bears a great resemblance, in all respects, 

 to the basalt of Aussig, in Bohemia. 



355. Hornblendic slate — very compact; jointed; tolerably thinly laminated; 

 colour, gray and reddish gray. Surface between the laminge and in the joints, 

 stained of a dirty yellow colour, by oxide of iron. 



