344 



DESCRIPTION 



THE 



COUNTRY 



The first rock which emerges from beneath the reel clay, is a dike of No. 422, 

 which is a continuation of one of the dikes seen on the Lake shore. In immediate 

 contact with this dike, on the lower side, is a rock which resembles some of -the 

 altered siliceous shales in colour and general appearance, as well as some of the 

 more laminated varieties of the metamorphosed sandstone, before described. It 

 more nearly resembles, however, the slaty greenstones higher up the creek. Rest- 

 ing on this last rock, is a dark-coloured, metamorphosed clay slate (No. 424), tra- 

 versed by a trap dike. In near contact with the dike, it assumes a trappous 

 appearance. This rock is so full of joints, which separate when it is struck with 

 the hammer, that it is exceedingly difficult to obtain a fresh fracture. It resembles 

 most of the metamorphosed clay slates found in contact with trap dikes at other 

 places. It continues to form the bed of the stream for several hundred yards, and 

 does not differ essentially in its characteristics at any points, except near the dike, 

 where it is somewhat brecciated. Traces of earthy green carbonate of copper were 

 discovered in this rock, near its junction with the dike. 



The beds which overlie those last named, again present the appearance of slaty 

 greenstone (No. 425). They are, however, undoubtedly sedimentary. Overlying 

 these beds is a bed of porphyritic greenstone (No. 426). It dips to the southeast, 

 at an angle of 11°, and forms the bed of the stream for the distance of a quarter of 

 a mile, with occasional exposures of No. 425, above it as well as below it, at the 

 points of the small ridges which come up to the creek, when it finally disappears, 

 and the upper beds of No. 425 continue to form the channel to within four hun- 

 dred yards of the Lake shore. At the point mentioned, the sedimentary rocks are 

 traversed by a narrow trap dike (No. 427), which forms a low ridge in its course, 

 trending to the north. Below this dike, No. 425 continues to the Lake shore, 

 where it is covered by a few feet of red clay. As the Lake is approached, some of 

 the beds become brecciated and amygdaloidal, the cells being filled with epidote, 

 chlorite, and some zeolites (No. 437). On the lake-shore, a short distance above 

 the mouth of the creek, the porphyritic greenstone, No. 426, is found underlying 

 No. 425. The prevailing dip of the rocks, from the mouth of the creek to the first 

 high ridge, is to the southeast, at an angle of 10° to 12°. Beyond the first ridge, 

 and up to the second one, the clip is northeast, varying to east-northeast ; and on 

 the lake-shore, at the point designated, the porphyritic greenstone dips 18° to the 

 southeast. 



Between the Entry Point and the mouth of Passabika River the metamorphosed 

 sedimentary rocks are traversed by a number of trap dikes, differing both in compo- 

 sition and bearing. At the north end of the point, the metamorphosed rock dips 

 east by north 14°. The first dike (No. 588), bearing north 30° east, is cut through 

 in the second bay below, by one bearing north 45° east (No. 589). This last dike 

 is behind the first one, at the point, and forms the ridge which gives the general 

 dip to the sedimentary rocks. In its prolongation southwest, it comes to St. Louis 

 River at the second expansion of that stream from the mouth, and is believed to 

 underlie the islands which occur there in the line of bearing. No. 588 is entirely 

 outside of this dike, and only to be seen at the second point down the Lake. 



A narrow dike (No. 592), bearing north 14° west, cuts through the metamor- 



