Two clearly defined series of glacial limit features, readily correlated and traced from place to place are inferred to mark the limits of the last glacial advance in central Yukon. These are the McConnell Moraine and an earlier advance, the Reid Moraine. In
addition, older glacial drift, till, erratics and modified landforms have been found beyond the clearly marked limits and perhaps record two earlier glaciations. These earlier features are referred to as the Klaza Drift (the younger) and the Nansen Drift (the older).
Changes of level of Kluane Lake suggest that the lake has not always drained through the Kluane River as it does today but has, during the Hypsithermal, drained through the Slims River valley into the Kaskawulsh River. This drainage theory was first published by
the writer in 1952 and the present paper includes data which has become available since that time. Features of change of level as well as possibilities of drainage reversal are here discussed and it remains the writer's conclusion that the drainage changes suggested in his original paper did indeed
occur.
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