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Reconnaissance surficial mapping in the upper St. John River area of northwestern Maine has shown that the latest Wisconsin events in the region were ice-flow reversal and southeastward ice marginal retreat. Widespread erratics derived from the Canadian Shield substantiate ice movement from the west or northwest into Maine prior to these events. Striations, rattails, and small-scale stoss-and-lee forms, all indicating northward and subsequently northwestward ice flow, are superimposed over earlier evidence showing eastward ice movement. Recessional ice-margin positions, delineated by lakes, drainage routes, and moraine segments, demonstrate that the ice margin retreated to the southeast following the emergence of the...

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