Extensive areas of glacio-lacustrine sediments were exposed by the partial draining of a glacial lake near Ely, Minnesota. A deep gully was excavated in the sediments by the draining of a bay of the lake. Samples of the lacustrine beds were collected and compared with samples taken from a delta built in the present remnant lake. The soluble constituents are limited to finely varved clays in the lacustrine bed, and none were retained in the delta sediments. Heavy minerals are confined to the finer size-grades in the lacustrine beds and show a resorting by currents in the delta sediments.

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