Pleistocene of the Winnipeg Basin. — Tyrrell. 23 
places, for most of the countiy between lakes Manitoba and Win- 
nipegosis and lake "Winnipeg is yet entirely unexplored. How- 
ever at many places on the shores of lake Manitoba, especiall}- 
towards its northern end, and on the shores and islands of lake 
Winnipegosis south of Birch island transported boulders are scat- 
tered in great abundance, or heaped in high boulder-walls. The 
north side of the high and even ridge between lake Winnipegosis 
and Cedar lake, and the south shore of this latter lake, are also 
composed to a considerable extent of en-atics. It is not improb- 
able, therefore, that these boulder-strewn tracks ma\' represent 
periods of cessation in the retreat of the glacier, but the morainic 
debris was dropped into lake Agassiz, and scattered more or less 
thickl}^ over its floor. 
On the shores and islands of lake Winnipeg a distinct moraine 
has just been recognized. It forms the high land on the eastern 
side of the lake between the mouth of Brokenhead river and Elk 
island ; crosses Black island near its northeastern extremity as an 
irregular, knoUy ridge with a summit one hundred feet above the 
water ; thence skirts the eastern margin of the lake, touching it in 
places, and was again recognized at Plunkett and Swampy islands, 
being there composed of an aggregation of boulders of Trenton 
and Archaean rocks. Many of the islands to the south of these 
two last mentioned are also probably morainic, but they have 
not 3'et been examined. 
North of Swamp}' island this moraine has not been followed, 
and as it was doubtless deposited in a considerable depth of water, 
the material falling from the face of the glacier was probably 
scattered over a considerably' area. It is possible, however, that 
George's island may be formed by it, and Eagle island, near the 
northwest extremity of the lake, is clearly morainic. 
Shore Lines. 
Ancient shore lines occur throughout the district from a hight 
of 1,440 feet above the sea on north Pine creek on the east face 
of the Duck mountain to about 750 feet above the sea around the 
margin of lake Winnipeg. In their southern extension, these 
ridges have already been described and classified l)y .Mr. Warren 
Uphara in liis desci'iption of lake Agassiz. 
In the lacustral region they have l)een followed by the writer 
most continuously along the face of the Duck mountain wliere 
they form long, unbroken ridges of gravel or sand from fifty to one 
