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The recession of the late Wisconsinan ice sheet from central Maine was characterized by several modes of deglaciation. Below the limit of marine submergence in the Augusta-Skowhegan area, the retreat of the ice margin is documented by end moraines. A DeGeer-type esker system and accompanying marine deltas were deposited in a succession of narrow, topographically controlled zones of stagnant ice that bordered the active ice margin.

Immediately inland from the marine limit, glaciofluvial deposits were graded to the sea. Examples occur in the Pleasant, Piscataquis, and upper Kennebec River Valleys. The large volumes of these deposits and the presence of...

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