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Age of the Berlin moraine complex, New Hampshire, USA, and implications for ice sheet dynamics and climate during Termination 1

  • Gordon R.M. Bromley (a1), Brenda L. Hall (a2), Woodrow B. Thompson (a3) and Thomas V. Lowell (a4)

Abstract

At its late Pleistocene maximum, the Laurentide Ice Sheet was the largest ice mass on Earth and a key player in the modulation of global climate and sea level. At the same time, this temperate ice sheet was itself sensitive to climate, and high-magnitude fluctuations in ice extent, reconstructed from relict glacial deposits, reflect past changes in atmospheric temperature. Here, we present a cosmogenic 10Be surface-exposure chronology for the Berlin moraines in the White Mountains of northern New Hampshire, USA, which supports the model that deglaciation of New England was interrupted by a pronounced advance of ice during the Bølling-Allerød. Together with recalculated 10Be ages from the southern New England coast, the expanded White Mountains moraine chronology also brackets the timing of ice sheet retreat in this sector of the Laurentide. In conjunction with existing chronological data, the moraine ages presented here suggest that deglaciation was widespread during Heinrich Stadial 1 event (~18–14.7 ka) despite apparently cold marine conditions in the adjacent North Atlantic. As part of the White Mountains moraine system, the Berlin chronology also places a new terrestrial constraint on the former glacial configuration during the marine incursion of the St. Lawrence River valley north of the White Mountains.

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Corresponding author

*Corresponding author at: School of Geography, Archaeology and Irish Studies, National University of Ireland Galway, GalwayH91 TK33, Ireland. E-mail address: gordon.bromley@nuigalway.ie (G.R.M. Bromley).

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Keywords

Age of the Berlin moraine complex, New Hampshire, USA, and implications for ice sheet dynamics and climate during Termination 1

  • Gordon R.M. Bromley (a1), Brenda L. Hall (a2), Woodrow B. Thompson (a3) and Thomas V. Lowell (a4)

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