Late Cenozoic glaciation of Alaska

Hamilton, Thomas D.

doi:10.1130/dnag-gna-g1.813

Cited by 114 publications

(185 citation statements)

References 82 publications

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“…They hypothesize that this ice complex formed one of several contiguous ice domes that rimmed the Eurasian Arctic from Scandinavia to Alaska. Unfortunately, this theoretical ice sheet is not based on physical "eld evidence despite long-standing published data demonstrating that such an ice sheet did not exist (see summaries in Bespaly, 1984;Isayeva, 1984;Arkhipov et al, 1986a, b;Hamilton, 1986;Biryukov et al, 1988). The hypothesis of an East Siberian Sea ice sheet has been erroneously perpetuated in the literature (cf.…”

Section: Ice Extent During the Lgmmentioning

confidence: 99%

“…Compilations of the sur"cial geology of Alaska (Coulter et al, 1965) provided the impetus in the 1960s for mapping and stratigraphic study of moraine and glacio#uvial sequences with relative-age estimates supported by available radiocarbon ages. Hamilton's statewide compilation (Hamilton, 1986) and his more recent review paper of the glaciations of Alaska (Hamilton, 1994) set the framework for the evaluation of new work documenting at least four major ice advances out of the DeLong Mountains into the Noatak Basin in northwestern Alaska. These advances terminated into a complex series of superposed proglacial lake sequences representing repeated damming of the Noatak drainage during periodic glaciations dating back to the early Pleistocene.…”

Section: Long-term Glacial/interglacial Paleoclimate and Ice Extent Dmentioning

confidence: 99%

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New perspectives on Beringian Quaternary paleogeography, stratigraphy, and glacial history

Brigham‐Grette

2001

Quaternary Science Reviews

115

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Aspects of the paleogeography, stratigraphy, and glacial history of Beringia have been greatly revised over the past 15}20 yr. Access to North East Russia, in particular, has provided the opportunity to evaluate the Beringia landscape as a contiguous subcontinent during the Quaternary. For the "rst time, new research has made clearer the connection between tectonic forces and the submergence of the Bering Strait during the middle Pliocene. Revisions in the regional stratigraphy of glacial and interglacial deposits in northwest Alaska and northeast Russia provide a new foundation for assessing the causes for di!erences in glacial ice extent through time. The consensus of all "eld workers veri"es that glacial ice throughout most of Beringia was of very limited extent during the last glacial maximum. The onset of regional glaciation during the waning stages of the last interglaciation is clearly out of phase with glaciation at lower latitudes. Despite the lack of much glacial activity during the early Holocene, Alaska contains a rich record of late Holocene glacial response to Neoglacial cooling. Changes in the Holocene environment of Beringia likely had a profound a!ect on early inhabitants. The curiosity-driven vision and spirit of both David Hopkins and the late Troy Pewe have had a profound in#uence on Arctic paleoenvironmental research.

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Section: Ice Extent During the Lgmmentioning

confidence: 99%

Section: Long-term Glacial/interglacial Paleoclimate and Ice Extent Dmentioning

confidence: 99%

New perspectives on Beringian Quaternary paleogeography, stratigraphy, and glacial history

Brigham‐Grette

2001

Quaternary Science Reviews

115

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“…Glaciers in the Brooks Range underwent a minor re-advance between B13,000 and 11,500 14 C yr BP, possibly in response to increasing winter snowfall (Hamilton, 1986). On the Arctic Coastal Plain, the Ikpikpuk dunes became inactive between B12,500 and 11,000 14 C yr BP, most likely in response to increased soil moisture (Carter, 1993).…”

Section: Synthesismentioning

confidence: 99%

“…Glaciers in the Brooks Range retreated from LGM before 14,000 14 C yr BP (Hamilton and Porter, 1975;Hamilton, 1986) and underwent minor re-advances near valley heads between 13,000 and 11,500 14 C yr BP, perhaps in response to increasing winter snowfall (Hamilton, 1986). Neoglaciation began in the Brooks Range perhaps as early as 7600 yr ago, though widespread advances did not occur until after 5000 yr ago (Calkin, 1988).…”

Section: Glacier Fluctuationsmentioning

confidence: 99%

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Responses of an arctic landscape to Lateglacial and early Holocene climatic changes: the importance of moisture

Mann

Peteet

Reanier³

et al. 2002

Quaternary Science Reviews

117

132

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Many of the physical and biological processes that characterize arctic ecosystems are unique to high latitudes, and their sensitivities to climate change are poorly understood. Stratigraphic records of land-surface processes and vegetation change in the Arctic Foothills of northern Alaska reveal how tundra landscapes responded to climatic changes between 13,000 and 8000 14 C yr BP. Peat deposition began and shrub vegetation became widespread ca. 12,500 14 C yr BP, probably in response to the advent of warmer and wetter climate. Increased slope erosion caused rapid alluviation in valleys, and Populus trees spread northward along braided floodplains before 11,000 14 C yr BP. Lake levels fell and streams incised their floodplains during the Younger Dryas (YD) (11,000-10,000 14 C yr BP). A hiatus in records of Populus suggest that its geographic range contracted, and pollen records of other species suggest a cooler and drier climate during this interval. Basal peats dating to the YD are rare, suggesting that rates of paludification slowed. Immediately after 10,000 14 C yr BP, lake levels rose, streams aggraded rapidly again, intense solifluction occurred, and Populus re-invaded the area. Moist acidic tundra vegetation was widespread by 8500 14 C yr BP along with wet, organic-rich soils. Most of these landscape-scale effects of climatic change involved changes in moisture. Although low temperature is the most conspicuous feature of arctic climate, shifts in effective moisture may be the proximate cause for many of the impacts that climate change has in arctic regions. r

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Coastal paleogeography and human occupation of the Western Alaska Peninsula

Jordan

Maschner

2000

Geoarchaeology

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Late Cenozoic glaciation of Alaska

Cited by 114 publications

References 82 publications

New perspectives on Beringian Quaternary paleogeography, stratigraphy, and glacial history

New perspectives on Beringian Quaternary paleogeography, stratigraphy, and glacial history

Responses of an arctic landscape to Lateglacial and early Holocene climatic changes: the importance of moisture

Coastal paleogeography and human occupation of the Western Alaska Peninsula

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