524 



APPENDIX. 



[No. I. 



have an ellipsoidal form and smooth surface, are from one to two feet in 

 diameter, and appear to consist of the same material with the basis, but im- 

 pregnated with much silica, and not shewing evident slaty structure. . When 

 broken, they present an even fine grained fracture. 



In the sheltered valleys on this part of Point Lake, a few clumps of good- 

 sized spruce fir occur ; farther to the eastward, at Obstruction Rapid, where the 

 gneiss formation of Fort Enterprise seems to cross the river, and extend beyond 

 Rum Lake, there is no wood. 



During our first and second day's journey down Point Lake from the above- 

 mentioned encampment, being eleven and a half miles on a W.N.W. course, 

 the rocks we had an opportunity of examining, consisted of greenish-grey 

 transition clay slate, generally having a curved structure, and splitting into 

 slates of very unequal thickness. 



On the following day, June 27th, our route lay to the N.W. for ten and a 

 half miles through a part of the lake, whose bounding hills bore a strong re- 

 semblance in altitude and form to those about Fort Enterprise. The rocks we 

 examined were grey gneiss, red granite, hornblendic gneiss, and a crystalline 

 greenstone. These rocks form high and precipitous islands, and shores at the 

 west end of Point Lake, but the appearance of the country alters immediately 

 on entering Red Rock Lake. The strata here belong, most probably, to the 

 transition series, which, at the lower end of Point Lake, had given place to, 

 or perhaps alternated with, primitive rocks. The hills which bound Red Rock 

 Lake are four hundred or five hundred feet high, have an even round-backed 

 outline, present few cliffs and little naked rock, have rather moderate acclivi- 

 ties, and are thinly covered with small white spruce trees. The cenomyce 

 ra?igiferina, and other lichens, so abundant on the barren grounds, become 

 rare here, and continue so throughout the remainder of the Copper-Mine River. 

 A bed of reddish clay slate was observed at the upper end of the lake, and 

 large fragments of the same rock thickly strew its shores. At the lower end 

 of the lake, a greenish-grey faintly glimmering clay slate occurs, dipping 

 W. b. N. at an angle of 30°. 



We passed through Rock-Nest Lake on June 30th. With the exception of 

 the Rock -Nest, and one or two hills adjoining it apparently composed of trap 

 rocks, the borders of this lake are low, consisting of long even gentle eleva- 

 tions, every where v. ell clothed with spruce trees. The strata, where we had 



