The Long Labrador Trail Part 20

Grand Lake is a body of fresh water forty miles long and from two to six miles in width, having a direction N. 75 degrees W. It lies in a deep valley between rocky hills that rise to a height of about four hundred feet above the lake, and was doubtless at one time an extension of Hamilton Inlet. At Cape Corbeau and Berry Head the rocks rise almost perpendicularly from the water; at the former place, to a height of three hundred feet. Except in a few places the hills are covered to their summits by a thick growth of small spruce and fir.

At the head of the lake there are two bays, one extending slightly to the southwest, the other nearly due north. Into the former flow the Susan and Beaver Rivers, while into the latter empties the water of the Nascaupee and Crooked Rivers. Besides these there are two small streams, the Cape Corbeau River on the south, and Watty's Brook on the north sh.o.r.e.

At the point where the Nascaupee and Crooked Rivers enter the lake there are two low islands of sand, and a great deal of sand is being carried down by the two streams and deposited in the lake, which is very shallow for some distance from the sh.o.r.e.

Three miles above the mouth of the Nascaupee River it is separated from the Crooked River by a plain of stratified sand and gravel, three-quarters of a mile wide, with two well-defined terraces. The first is twenty feet above the river and extends back some three hundred yards to a second terrace, rising seventy-five feet above the first.

Half way between this terrace and the Crooked River is, the old bed of the Nascaupee River, nearly parallel to its present course. A similar abandoned channel curve was found, making a small arc to the south of the Crooked River.

Above Grand Lake the Nascaupee River flows through an ancient valley, which is from a few hundred yards to a mile wide and cut deep into the old Archaean rocks, affording an excellent example of river erosion.

The banks are of sand, and in some places clay, extending back to the foot of the precipitous hills. Apparently the ancient river valley has been partly filled with drift, down through which the river has cut its way; the present bed of the stream being of post glacial formation.

The general direction of the river is N. 83 degrees W.

Fifteen miles above Grand Lake, the Red River joins the main stream, coming from N. 87 degrees W. Below its junction with the latter stream, the Nascaupee River has a width varying between two and three hundred yards, and an average depth of about ten feet.

The Red River is two hundred feet wide, and its water, unlike that of the main stream, has a red brown color, like that of many of the streams of Ontario which have their source in swamp or Muskeg lands.

The first rapids in the Red River are said to be eight miles above its mouth. Directly opposite the junction of the two streams the portage leaves the Nascaupee River. The direction is N. 24 degrees E. and the distance five and one-half miles, with an elevation of 1050 feet above the river at the end of the second mile.

The last three and one-half miles lead across a level tableland, to a small lake, from which the trail descends through two lakes into a shallow valley.

The entire country from the head of Grand Lake to this point has been devastated by fire, only a few trees near the water having escaped destruction, and the ground, except in a few places, is dest.i.tute even of its usual covering of reindeer moss.

The underlying rock is gneiss, and the country from the Nascaupee River is thickly strewn with huge glacial bowlders.

The majority of these bowlders have been derived from the immediate vicinity, but many consisting of a coa.r.s.e pegmat.i.te carrying considerable quant.i.ties of ilmenite were observed. None of this rock was seen in place.

The valley last mentioned is separated from the Crooked River by Caribou Ridge, a broad, flat-topped elevation, three hundred and fifty feet high, dotted by small lakes, which fill almost every appreciable depression in the rock.

The general course to the Crooked River is northeast; at the point where the portage reaches it the stream is fifty yards wide and very shallow; flowing over a bed of coa.r.s.e drift, which obstructs the river, forming a series of small lake expansions with rapids at the outlet of each. Between Grand Lake and the point where we reached the river, the Indians say it is not navigable in canoes, owing to rapids.

The Crooked River has its source in Lake Nipis.h.i.+sh, which is about twenty-two miles long, with an average width of three miles, and a course due north. Six miles above the outlet of the lake is a bay, five miles long, extending N. 80 degrees W.

Along the north sh.o.r.e of the lake and in the bay are several small islands of drift, and many huge angular bowlders projecting above the water. The country in the vicinity of the lake and in the valley of the Crooked River is covered with mounds and ridges of drift and many small moraines.

These moraines consisting of bowlders for the most part from the immediate vicinity, seemed to have no given direction, but were usually found at the ends of, and in a transverse direction to the ridges.

The trail leaves Lake Nipis.h.i.+sh near the head of the large bay, continuing in a direction between north and northwest, through several insignificant lakes, all drained indirectly by the Crooked River, until it reached Otter Lake, which is eight miles long, running nearly north and south, and is five hundred and fifty feet below the summits of the surrounding hills.

From Otter Lake, the course is west through five diminutive lakes, and across a series of sandy ridges to a small shallow lake, which is the source of Babewendigash River. Between this lake and Seal Lake intervene a high range of mountains--the highest seen on the journey to Lake Michikamau--rising fully one thousand feet above the level of Seal Lake. They are visible for miles in any direction, and were seen from Caribou Ridge nearly a month before we reached them.

They are glaciated to their summits, which are entirely dest.i.tute of vegetation and in August were still, in places, covered with snow.

Babewendigash River winds to and fro between the mountains, its course being determined to a great extent by esker ridges that follow it on either side and which are often more than one hundred feet high.

Throughout its length of twenty-five miles there are five rapids and three small lake expansions.

Seal Lake, into which the river flows, is in part an expansion of the Nascaupee River and fills a basin surrounded on every side by mountains, rising several hundred feet above the water. The lake is comparatively shallow, and has a perceptible current. There are several small islands of drift, covered by a scanty growth of spruce and willow. The main lake has direction N. 45 degrees W., and is ten miles long and two and one-half miles wide. The northwestern arm is fifteen miles long, with the same width, and a course N. 80 degrees W.

The steep rocky sh.o.r.es have precluded the formation of terraces. Above Seal Lake the course of the Nascaupee River varies between N. 40 degrees W. and N. 80 degrees W.

Five miles above the lake there is an expansion of the river, called Wuchusk Nipi, or Muskrat Lake, which is eight miles long and a mile and a half wide, with a course N. 40 degrees W. Except for a channel along the western sh.o.r.e, the lake is very shallow, being nearly filled with sand carried down by the river. There is a small stream flowing into this lake expansion near its head, called Wuchusk Nipis.h.i.+sh.

For fifty miles above Muskrat Lake, the river flows between sandy banks, marked on either side by two well-defined terraces. The river valley gradually becomes more narrow and the current stronger and with the exception of a few small expansions, progress is only possible by means of tracking. There are, however, in this distance but two rapids necessitating portages.

Opposite the point where the portage leaves the Nascaupee to make a second long detour around rapids, a small river flows in from the southwest, having a sheer fall of almost fifty feet, just above its junction with the main stream.

The trail, after leaving the river, has a course N. 35 degrees W. for two miles; it then turns N. 85 degrees W. six miles, and again N. 55 degrees W. four miles.

In its course are four small lakes, but there is an unbroken portage of eight miles between the last two. Nearly the whole country has been denuded by fire, and the prospect is desolate in the extreme. The end of the portage is on the high rolling plateau of the interior, timbered by a spa.r.s.e and stunted second growth of spruce, covered everywhere with white reindeer moss, and strewn with lakes innumerable.

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 Kash.e.s.h.ebogamog 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 pegmat.i.te 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 biot.i.te, 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 magnet.i.te, is twenty-five feet south of the second. Only the first is distinguished by the segregation of the quartz.

The next outcrop observed was on the portage from the Nascaupee River.

The rock, a biot.i.te granite gneiss [4] having a strike N. 82 degrees E.

is much weathered and split by the action of the frost, and marked by pockets of quartz, usually four or five inches in width.

Between this point and Lake Nipis.h.i.+sh the underlying rock differs only in being more extremely crushed and foliated. The one exception is on Caribou Ridge, which is capped by a much altered gabbro. [6]

The first noticeable change in the character of the country rock is a Washkagama Lake, where a fine grained epidotic schist [7] was observed, having a dip 82 degrees W. and a strike S. 78 degrees E.

At Otter Lake a much foliated and weathered phyllite [8] was found.

Strike N. 73 degrees E. and a dip of 16 degrees.

On the Babewendigash River seven miles east of Seal Lake is an exposure of highly metamorphosed ancient sedimentary rocks. The outcrop occurs at a height of four hundred feet above the river; and there is a well-marked stratification.

The lowest bed of a calcarous sericitic schist [9] is four feet thick and underlies a bed of schistose lime stone [10] six feet in thickness, which is in turn covered by a finely laminated phyllite, [11] ten feet thick. The whole is capped by thirty feet of quartzite, [12] which forms the top of a long ridge.

Owing to the strong weathering action this thickness of quartzite is doubtless much less than it was originally.