The trail which runs N. 50 degrees W. and has not been used for eight years, gradually became more and more indistinct, until on Bibiquasin Lake it disappeared entirely. Thereafter the course was N. 70 degrees W., and finally due west, through a series of lakes which at last brought us to Lake Michikamau. The largest of this series is Kasheshebogamog Lake, a sheet of water twenty-three miles long, but broken by numerous bays and countless islands of drift, with a direction S. 75 degrees W. The lake is confined between long bowlder-covered ridges, and is fed at its western end by a small stream.
Although its outlet was not discovered, it doubtless drains into the Nascaupee River.
On the return journey an attempt was made to descend the Nascaupee River below Seal Lake.
The river leaves the lake at its southeastern extremity, flowing between hills that rise almost straight from the waters edge, and is one long continuation of heavy rapids. After following the stream for two days we were obliged to retrace our steps to Seal Lake, thereafter keeping to the course pursued on the inland journey.
DETAILS OF ROCK EXPOSURE
The numbers following the names of rocks refer to corresponding numbers in appendix.
Of the rocks observed, by far the greater number are foliated basic eruptives,—schists and gneisses. There are, however, some that are of undoubted sedimentary origin, but highly metamorphosed.
The general direction of foliation is a few degrees south of east, subject, of course, to many local changes.
Along Grand Lake the rock is a compact amphibolite [3] with a strike S. 78 degrees E. cut by numerous pegmatite dikes, having a strike N. 30 degrees W. and a dip 79 degrees W.. These dikes vary in width from three to twenty feet. Half way to the head of the lake is a dike [1] having a total width of eight feet, consisting of a central band of segregated quartz, six feet wide, cut by numerous thin sheets of biotite, which probably mark the planes of shearing. The quartz is bordered on either side by a band of orthoclase,’ one foot in width. Between these bands of orthoclase and the neighboring amphibolite are narrow bands of schist [2]
One hundred feet south of the above point is a second dike having a similar strike and dip and a width of eighteen feet. A third narrow dike, containing small pockets of magnetite, is twenty-five feet south of the second. Only the first is distinguished by the segregation of the quartz.