Introduction Among the thousands of lakes in Canada there are hundreds that are apparently rock-rimmed, having their outlet over sills of solid rock and having shores of rock in most places; but generally there is some drift-covered point in the circumference of the basin where an old channel may be concealed. It is not often that one can actually trace the solid rock entirely round the shore with no point hidden. This is the case, however, with the two small lakes near the Helen mine which are to be described in this paper.
The causes of rock inclosed basins are various, most of them in Canada being due to glacial action, the rock surface having been excavated by the ice unequally, probably because of preglacial decay having extended to unequal depths, though it was commonly believed in earlier times that undecayed rocks could be deeply eroded by ice, and that . . .
- © 1902 Geological Society of America