- I D - lH-EA8T Tl Hi. I |m|;v 



micaceous; and then twenty foe! of highly quartxifer- 

 ooa unci--, containing quantities of large 01 thoclase crystals ami a little 

 mica. A ; of alternate bands of red and grey gneissi 



vaiying in color with the quantity of mica present, and from the same 

 tore, being fine-grained when an excess of that 

 mineral is present, The dip of these hands is S. 40 E. 60°. 



occurs about four miles beyond the last, and two 

 miles below the firsl fall. 'I I and grey gneiss. 



Similar exposur lip N. 60 W. 15 60°, are seen at the 



falls. « >n the shore, immediately below the fall, are large beds of iron 

 and garnet sands. These have been washed there i>v Idyin 



river al this point, having been carried down from some poinl farther 

 up the stream, where they are formed by the disintegration of the 

 iron-bearing gn< uently mentioned. Red and grey gn 



were seen, at distances of one, two, four and nine miles above the tall-, 

 having a dip of v 60 B 7" . 



At the foot of the four-mile portage, and fourteen miles above the 

 firsl tall, was seen a yellowish-grey gneiss, composed chiefly of quartz 

 ami mica, and covered with a lihu of black oxide of iron about one- 



ghth of an inch thick. This rock i- a decomposition product of the 

 ordinary red gneiss, charged with grains of magnetic iron, and has 

 been formed in the manner described in a subsequent paragraph. A 

 Bhort distance beyond, these rock- were found highly charged with 

 magnetite in small grains. Dip N. 20° W. T"> Six miles beyond, 

 greyish and pink gneiss, apparently holding much iron outcrops, with 

 a strike S. 70 W. Three mile- farther,dark red coarse-grained gneiss ; 

 strikes. 50 W. 



Ai a small fall, three and a-half mile- above the last exposure, i- a 

 s, weathering a pale buff, and highly charged with magnetic 

 iron in lenticular beds and -mall grains. The beds vary in width 

 along their course from half an inch to eight inches. 



At the second -mall lake on the ten-mile portage, an exposure of 

 coarse-grained red granitoid gneiss was -ecu. On the fourth Lake 

 ii- tine banded red gneiss. Dip S. )•"> E. 15°. Enters tratified 

 with these are fed- of a micaceous iron ore, seemingly of great extent. 

 I'nc-c lied- an- noi pure, hut in the form of a gneiss, composed of 

 quartz, mica and hornblende, with a xevy large percentage of iron ore. 



< >n the last lake oi the portage, besides the red gneiss, loose 

 angular blocks ol a dark greyish-blue trap, containing minute crystals 



lark green hornblende and grains of dark grey quartz, wen 

 scattered along the shore, and had evidently not travelled far. Con 



-iderahle fed- of the iron bearing rocks are also -ecu on the lake. 



interstratified with the red gneiss. 



