532 



APPENDIX. 



[No. 1. 



coloured red or grey in thin horizontal strata. On the northern extremity of 

 the island, there is a red amygdaloidal rock which contains many beautiful 

 pebbles, and some imbedded masses of jasper. Most of the pebbles are 

 composed of concentric layers of calcedony with drusy cavities, but some of 

 them approach nearly to pure carnelian. 



Near the encampment of August 3, a dark red cliff, probably of claystone 

 porphyry, is intersected by a vein several yards thick of a bluish-white 

 substance. The vein made an angle of forty-five with the horizon, and was 

 seen at a considerable distance. We had no opportunity of examining it. 

 Nearly opposite to this, near Sir James Gordon's Bay and Tinney's Cove, 

 some portions of the sandstone strata, of a reddish-grey colour, have a beau- 

 tiful porphyritic appearance from imbedded pieces of white quartz, mostly 

 quadrangular, and about an inch in diameter. Other portions of the rock had 

 none of these imbedded pieces. 



Between this spot and the mouth of Back's River, the eastern shore of 

 Bathurst's Inlet consists of gneiss, with beds of granite, forming a continued 

 range of hills rising pretty steeply from the water to the height of five or six 

 hundred feet. 



In Sir James Gordon's Bay, the strata consist chiefly of light red and 

 greyish sandstone, still of the new red sandstone formation, with trap rocks 

 generally greenstone. To the northward of Fowler's Bay, the gneiss re- 

 appears, containing beds of granite and hornblendic gneiss. In one spot near 

 Point Evritt, hexagonal crystals of hornblende, some of them above a foot 

 long, occur, imbedded in the gneiss. Most of the crystals were contaminated 

 with scales of mica. The islands in the offing consist, as usual, of flcetz 

 trap, or porphyry ; and on the north side of Buchan's Bay, the new red sand- 

 stone re-appears, having a fine grain and light-red colour. Cape Croker is 

 composed of red sandstone, whose debris form a shelving and utterly barren 

 shore. 



The northern shore of Melville Sound has a barren clayey soil, which, 

 when washed away, exposes strata of greyish-white sandstone, associated 

 with or passing into a slaty clay. A few cliffs of greenstone or claystone 

 porphyry, superimposed on the flat strata, presented from the opposite coast 

 as we entered the sound, the appearance of islands. Had the intermediate 

 low land been visible, a tedious circumnavigation of the sound would have 



