522 



APPENDIX. 



[No. I. 



the Round Rock, which commences about half a mile below the last-mentioned 

 hill, and runs twelve miles in a S. S. W. direction, a red porphyritic gneiss, 

 forming many mural precipices, exists subordinate to grey gneiss ; the same 

 rocks occur, with little variation, in Snare Lake, which immediately succeeds 

 the other, and is fifteen miles long. But about thirty-six miles S. S. W. from 

 Fort Enterprise, we again come upon the granite formation, through whieh we 

 passed on our route from Fort Providence, and the country is well wooded. 

 Specimens of the rocks obtained from that neighbourhood consisted of red 

 granite, granite with pistacite, porphyritic, and hornblendic gneiss. 



Returning again to Fort Enterprise— about two miles E. N. E. of the fort, or 

 nearly the same distance N. E. of Big Stone Hill, there occur a succession of 

 low cliffs formed by strata dipping north at an angle of 30°. The strata occur 

 in the following order, beginning with the lowest :— gneiss with hornblende 

 — red gneiss— ditto — coarse granular grey gneiss — ditto — ditto — and the 

 covering stratum is composed of red granite and granitic gneiss, with kidneys 

 of hornblende and mica. An obtuse conical hill, bearing N. N. E. from the 

 fort, and three miles and a half distant, consists of strata arranged in a mantle 

 form, but deficient on the N. E. side, where it is precipitous. This precipice 

 is separated by regular fissures into large cubical masses similar to many 

 which have accumulated at its base, and consists of hornblendic gneiss, which 

 seems to constitute the nucleus or body of the hill. A thin layer of compact 

 gneiss is wrapped round the hornblendic gneiss, and forms the acclivity and 

 summit of the hill, making an angle of 70° with the horizon. Covering the 

 base of this stratum, there is one of micaceous gneiss, over which there lies 

 a thick bed of compact quartzy greenstone with disseminated magnetic 

 pyrites. This rock affects the compass strongly, and its surface is variegated 

 with streaks of a rusty brown colour from the weathering of the pyrites. 

 Over the greenstone there is a bed of white granite. About half a mile to 

 the eastward of the last-mentioned hill, there is a high bluff one which has a 

 precipitous side fronting the S. W. The base of the precipice is formed of 

 coarse granular gneiss, the summit of red granite, which falls down in tabular 

 or cubical fragments. The Dog-Rib Rock, a remarkable hill, having three 

 precipitous sides but a gradual ascent on the fourth, lies about eight miles 

 N. b. E. from Fort Enterprise. The base of the hill consists of compact 



