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Each of the five major river valleys in the Cascade Range that drain the slopes of Mount Rainier volcano contains deposits formed during repeated Pleistocene glaciations. Drift of at least two ancient glaciations is recognized by deep weathering profiles on till, in which stones have been mostly or wholly altered to clay to depths of as much as 3 m. During one of these glaciations, a glacier in the Cowlitz River valley reached a point about 120 km down valley from Mount Rainier. A nearly continuous icecap probably mantled the Cascade Range at that time.
Crandell et al. (Tue,) studied this question.