238 



D E S C R 1 P T I V E 



0 A T ALOG U E 



296. Basaltic rock — colour, purplish gray; homogeneous; fracture, slightly irre- 

 gular. 



297. Greenstone — highly crystalline ; contains a few flesh-coloured crystals of 

 felspar ; colour, very dark gray, with a bluish tint. Weathers with an iron-shot 

 crust. 



298. From a vein traversing No. 294 — contains small pebbles, calcareous spar, 

 zeolites, and green earth. 



299. Metamorphosed siliceous shale — colour, greenish gray ; some of the beds 

 gritty. Contains organic impressions, like those found in the altered shales of 

 Passabika River. 



300. Conglomerate — the paste containing calcareous spar and green earth. 



301. Basaltic trap— like No. 29G. 



302. Metamorphosed siliceous shale — amygdaloidal in some places ; in general, 

 but little altered. 



303. Greenstone — like No. 297. 



304. Metamorphosed siliceous shale — colour, red; resembles, somewhat, the top 

 rock of the "Great Palisades;" has a jasperoid appearance. 



305. Hornblende rock — highly crystalline. 



306. Greenstone — finely crystalline ; contains many small crystals of red felspar; 

 the hornblende predominates. 



307. Basaltic rock — colour, greenish gray ; very fine-grained. 



308. Metamorphosed argillaceous shale — amygdaloidal; the cells few, and con- 

 taining zeolites ; colour, gray, with a greenish tint ; compact ; irregular conchoidal 

 fracture. 



309. Porphyry — the paste hornblendic, and filled with large crystals of felsjoar; 

 colour, dark gray ; very crystalline ; the felspar crystals tabular. 



310. Basaltic rock — colour, dark gray, almost black ; resembles the dolerites, 

 and may belong to that variety of greenstone. 



311. 312. Varieties of No. 309. 



313. Basaltic rock — colour, dark purplish gray ; fracture, uneven. 



314. Basaltic rock — decomposing into an ochre ; colour, red ; fracture, nodular ; 

 amygdaloidal ; cells few, and filled with carbonate of lime and zeolites ; very ferru- 

 ginous. 



315. Volcanic grit — overlies No. 314 ; its material derived in part from that 

 rock ; ferruginous ; incrustations of iron rust in the joints. 



316. Metamorphosed siliceous shale — colour, deep red; very fine-grained ; con- 

 tains organic impressions like those of No. 299. 



317. Metamorphosed argillo-siliceous shale — contains numerous horizontal black 

 stripes ; has a trappous appearance. 



318. Metamorphosed shaly sand-rock — resembles No. 317 somewhat; amygda- 

 loidal ; the cells being filled with thalite. 



319. Dolerite — compact; massive; fine-grained; colour, dark greenish gray. 



320. Basaltic rock — colour, dark greenish gray ; the joints contain chlorite and 

 stilbite ; fine-grained ; homogeneous ; fracture, irregular and uneven. 



