Laurentide ice sheet thinning and erosive regimes at Mount Washington, New Hampshire, inferred from multiple cosmogenic nuclides

2020 ◽  
Author(s):  
Alexandria J. Koester ◽  
Jeremy D. Shakun ◽  
Paul R. Bierman ◽  
P. Thompson Davis ◽  
Lee B. Corbett ◽  
...  
Keyword(s):  
New Hampshire ◽  
Ice Sheet ◽  
Cosmogenic Nuclides ◽  
Laurentide Ice Sheet ◽  
Mount Washington

scholarly journals Supplemental Material: Laurentide ice sheet thinning and erosive regimes at Mount Washington, New Hampshire, inferred from multiple cosmogenic nuclides

2020 ◽  
Author(s):  
Alexandria J. Koester ◽  
et al.
Keyword(s):  
New Hampshire ◽  
Ice Sheet ◽  
Cosmogenic Nuclides ◽  
Laurentide Ice Sheet ◽  
Cosmogenic Nuclide ◽  
Mount Washington

<div>Mount Washington cosmogenic nuclide data and modeled ice sheet profile</div><div><br></div>

scholarly journals Supplemental Material: Laurentide ice sheet thinning and erosive regimes at Mount Washington, New Hampshire, inferred from multiple cosmogenic nuclides

2020 ◽  
Author(s):  
Alexandria J. Koester ◽  
et al.
Keyword(s):  
New Hampshire ◽  
Ice Sheet ◽  
Cosmogenic Nuclides ◽  
Laurentide Ice Sheet ◽  
Cosmogenic Nuclide ◽  
Mount Washington

<div>Mount Washington cosmogenic nuclide data and modeled ice sheet profile</div><div><br></div>

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

2019 ◽  
Vol 94 ◽  
pp. 80-93
Author(s):  
Gordon R.M. Bromley ◽  
Brenda L. Hall ◽  
Woodrow B. Thompson ◽  
Thomas V. Lowell
Keyword(s):  
New England ◽  
New Hampshire ◽  
Global Climate ◽  
Ice Sheet ◽  
Atmospheric Temperature ◽  
Laurentide Ice Sheet ◽  
White Mountains ◽  
Southern New England ◽  
Ice Sheet Dynamics ◽  
St Lawrence River

AbstractAt 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.

scholarly journals Till Stratigraphy and Late Wisconsinan Deglaciation of Southern Maine: A Review

2007 ◽  
Vol 39 (2) ◽  
pp. 199-214 ◽  
Author(s):  
Woodrow B. Thompson ◽  
Harold W. Borns Jr.
Keyword(s):  
New England ◽  
New Hampshire ◽  
Ice Sheet ◽  
Ocean Floor ◽  
Laurentide Ice Sheet ◽  
Marine Transgression ◽  
Coastal Lowland ◽  
Southern New England ◽  
Clay Deposits ◽  
Late Wisconsinan

ABSTRACT At least two glaciations are recorded by the till stratigraphy of southern Maine. A more deeply weathered lower till is tentatively correlated with the early Wisconsinan (or older) Nash Stream Till in New Hampshire and its inferred equivalents in southern New England and Québec. The Laurentide Ice Sheet flowed south-southeastward across southern Maine in late Wisconsinan time and deposited the upper till. By about 14,000 years ago the ice sheet started to recede from the Maine coast, and the high peaks of the Mahoosuc Range emerged as nunataks in western Maine. Marine transgression accompanied déglaciation of lowland areas of southern Maine, with deposition of end moraines, deltas, and subaqueous outwash along the active ice margin, while thick clay deposits of the Presumpscot Formation accumulated on the ocean floor. The ice margin retreated quickly, reaching the marine limit in central Maine by 13,000 yr BP. The Pineo Ridge moraine system in eastern Maine, formerly thought to represent a major readvance, is reinterpreted as a glacial stillstand near the marine limit. Deglaciation inland from the marine limit in eastern and southwestern Maine occurred by recession of an active ice margin in some areas, and elsewhere by stagnation and downwasting of ice that was separated from the active ice sheet. Southern Maine was ice-free by 12,000 yr BP. but marine submergence persisted until about 11,000 years ago in the southwestern coastal lowland.

MULTIPLE COSMOGENIC NUCLIDES CONSTRAIN LAURENTIDE ICE SHEET HISTORY AND PROCESS ON MT. MANSFIELD, VERMONT’S HIGHEST PEAK

2018 ◽  
Author(s):  
Lee B. Corbett ◽  
◽  
Paul R. Bierman ◽  
Stephen F. Wright ◽  
Jeremy D. Shakun ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Cosmogenic Nuclides ◽  
Laurentide Ice Sheet

Analysis of multiple cosmogenic nuclides constrains Laurentide Ice Sheet history and process on Mt. Mansfield, Vermont's highest peak

2019 ◽  
Vol 205 ◽  
pp. 234-246 ◽  
Author(s):  
Lee B. Corbett ◽  
Paul R. Bierman ◽  
Stephen F. Wright ◽  
Jeremy D. Shakun ◽  
P. Thompson Davis ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Cosmogenic Nuclides ◽  
Laurentide Ice Sheet

Late glacial fluctuations of the Laurentide Ice Sheet in the White Mountains of Maine and New Hampshire, U.S.A.

2015 ◽  
Vol 83 (3) ◽  
pp. 522-530 ◽  
Author(s):  
Gordon R.M. Bromley ◽  
Brenda L. Hall ◽  
Woodrow B. Thompson ◽  
Michael R. Kaplan ◽  
Juan Luis Garcia ◽  
...  
Keyword(s):  
New England ◽  
New Hampshire ◽  
Ice Sheet ◽  
Late Glacial ◽  
Laurentide Ice Sheet ◽  
White Mountains ◽  
Northern New England ◽  
The Mean ◽  
Ice Sheet Dynamics ◽  
Complex Relationships

Prominent moraines deposited by the Laurentide Ice Sheet in northern New England document readvances, or stillstands, of the ice margin during overall deglaciation. However, until now, the paucity of direct chronologies over much of the region has precluded meaningful assessment of the mechanisms that drove these events, or of the complex relationships between ice-sheet dynamics and climate. As a step towards addressing this problem, we present a cosmogenic 10Be surface-exposure chronology from the Androscoggin moraine complex, located in the White Mountains of western Maine and northern New Hampshire, as well as four recalculated ages from the nearby Littleton–Bethlehem moraine. Seven internally consistent 10Be ages from the Androscoggin terminal moraines indicate that advance culminated ~ 13.2 ± 0.8 ka, in close agreement with the mean age of the neighboring Littleton–Bethlehem complex. Together, these two datasets indicate stabilization or advance of the ice-sheet margin in northern New England, at ~ 14–13 ka, during the Allerød/Greenland Interstadial I.

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