The new North American Varve Chronology: A precise record of southeastern Laurentide Ice Sheet deglaciation and climate, 18.2-12.5 kyr BP, and correlations with Greenland ice core records

Ridge, John C.; Balco, Greg; Bayless, Robert L.; Beck, Catherine C.; Carter, Laura B.; Dean, Jody L.; Voytek, Emily B.; Wei, Jeremy H.

doi:10.2475/07.2012.01

Cited by 104 publications

(211 citation statements)

References 82 publications

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“…2a). Marshall et al (2002) highlight a similar disparity, noting that, "the isostatic record demands substantial ice thinning subsequent to LGM, at a time (14-20 ka) when there is no strong signal of ice sheet retreat (Dyke and Prest, 1987 (Lambeck et al, 2014) LIS areal extent (blue) (Dyke, 2004), and northward LIS retreat in central New England based on varves (red) (Ridge et al, 2012). (b) Greenland δ 18 O, a proxy for temperature (NGRIP members, 2004).…”

Section: The Oldest Dryas (19-146 Ka)mentioning

confidence: 99%

“…4) before ~25 ka as indicated by recalculated 10 Be exposure ages on terminal moraines from Martha's Vineyard, MA (27.5 ± 1.6 ka, Balco et al, 2002) and northern New Jersey (25.2 ± 1.3 ka, . After the LIS began pulling back from its terminal moraines, northward retreat was gradual through several millennia at ~50 m/year (Ridge et al, 2012), then increased after ~20 ka likely due to increased Northern Hemisphere insolation . There is little indication of Heinrich event 1 at the southern margin, except perhaps indirectly, with the modest Chicopee readvance in Massachusetts at 17.3 ka, possibly occurring in response to North Atlantic cooling (Ridge et al, 2012).…”

Section: Ice Extentmentioning

confidence: 99%

“…Central New England has one of the best-constrained ice margin histories in the world (Fig. 4), owing to considerable 14 C dating of lakes and bogs, and in particular, extensive varve sequences, which have been tied to the 14 C timescale and the Greenland ice core record (Ridge et al, 2004(Ridge et al, , 2012. Furthermore, 10 Be ages from the Connecticut and Champlain Valley lowlands have also been linked to these other chronometers, resulting in a precise regional production rate calibration (Balco et al, 2009).…”

Section: Southeastern Laurentide Deglaciationmentioning

confidence: 99%

“…Research over the past several decades has generated ever more precise reconstructions of ice sheet extent histories based on organic 14 C (e.g., Dyke, 2004), cosmogenic nuclides (e.g., Balco et al, 2002;Carlson et al, 2007;Rinterknecht et al, 2006), and varve dating (e.g., Ridge et al, 2012). In contrast, the thickness evolution of the ice sheets has been far more difficult to constrain, largely because the ice sheets generally covered flat regions.…”

Section: Introductionmentioning

confidence: 99%

“…Dyke et al, 2004), glacial varves (Ridge, 2004;Ridge et al, 2012), and cosmogenic nuclide dating (Balco et al, 2002;Balco and Schaefer, 2006;Bierman et al, 2015;Bromley et al, 2015;Davis et al, 2015;Corbett et al, 2017;Koester et al, 2017;Hall et al, 2017;Fig. 4).…”

Section: Ice Extentmentioning

confidence: 99%

See 4 more Smart Citations

Applying the Cosmogenic Nuclide Dipstick Model for Deglaciation of Mt. Washington

Davis¹,

Koester²,

Shakun³

et al. 2017

New England Intercollegiate Geological Conference 2017

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Section: The Oldest Dryas (19-146 Ka)mentioning

confidence: 99%

Section: Ice Extentmentioning

confidence: 99%

Section: Southeastern Laurentide Deglaciationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Ice Extentmentioning

confidence: 99%

See 3 more Smart Citations

Applying the Cosmogenic Nuclide Dipstick Model for Deglaciation of Mt. Washington

Davis¹,

Koester²,

Shakun³

et al. 2017

New England Intercollegiate Geological Conference 2017

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Historically unprecedented erosion from Tropical Storm Irene due to high antecedent precipitation

Yellen

Woodruff

Cook

et al. 2016

Earth Surf Processes Landf

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Lacustrine sediment archives indicate that flooding during Tropical Storm Irene (2011) in the north‐eastern United States caused the most severe erosion of any flood in the historic record, surpassing that of events with greater precipitation and peak discharges. Compared to deposition from historic floods, Irene's event layer was more massive and more enriched in unweathered upland sediments, indicating an anomalously high incidence of mass wasting and sediment entrainment. Precipitation records indicate that neither precipitation intensity nor total accumulation distinguished Irene from less erosive historic floods. However, cumulative precipitation prior to Irene exceeded the 95th percentile of all days in the record. When allowing for non‐stationarity in the twentieth century background precipitation, we find a four‐fold increase in the probability of Irene‐like conditions, where impacts of extreme rainfall are enhanced by high antecedent precipitation. We conclude that irrespective of increases in extreme precipitation, the risk of highly erosive flooding in the region is increasing due to the influence of wetter baseline conditions associated with a changing climate. Copyright © 2015 John Wiley & Sons, Ltd.

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Periglacial resurfacing of hillslopes and channels with large boulders in the Virginia Appalachians

Fame,

Chilton,

Spotila

et al. 2023

Earth Surf Processes Landf

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Large, resistant, quartz‐rich boulders deposited on hillslopes and in channels armour the landscape, trap sediment and influence hillslope angle and erodibility. In the Virginia Appalachians, such boulders are a significant component of hillslopes and channels. Establishing the timing of and processes responsible for bedrock fracture and boulder deposition is a critical piece of understanding the landscape as a system. In this study, we use cosmogenic 10Be exposure dating to resolve the timing of boulder deposition at three sites in the Virginia Valley and Ridge province: Gap Mountain, Brush Mountain and Little Stony Creek, and at one site in the Virginia Blue Ridge: Devil's Marbleyard. The correlation between measured boulder exposure ages (101.7 ± 6.9 ka to 10.8 ± 0.8 ka; n = 23) and the Wisconsin Glacial Stage and subsequent Laurentide Ice Sheet (LIS) deglaciation (~115–11.7 ka) suggests a periglacial origin for deposition of large hillslope and channel boulders in the Virginia Appalachians. The lack of boulder exposure ages corresponding to the Last Interglacial Stage or following Wisconsin LIS retreat suggests interglacial non‐deposition and stability. The absence of exposure ages from the penultimate Illinoian or older Quaternary Glacial Stages suggests that periglacial hillslope processes allow the landscape to be resurfaced with large boulders during each return to cold climate conditions. This cyclic resurfacing of hillslopes and channels is an example of how climatic oscillations insert disequilibrium into the landscape cycle and contributes to our appreciation of the timescales over which contemporary climate change may impact boulder dominated landscapes in rapidly warming alpine and arctic environments.

show abstract

The new North American Varve Chronology: A precise record of southeastern Laurentide Ice Sheet deglaciation and climate, 18.2-12.5 kyr BP, and correlations with Greenland ice core records

Cited by 104 publications

References 82 publications

Applying the Cosmogenic Nuclide Dipstick Model for Deglaciation of Mt. Washington

Applying the Cosmogenic Nuclide Dipstick Model for Deglaciation of Mt. Washington

Historically unprecedented erosion from Tropical Storm Irene due to high antecedent precipitation

Periglacial resurfacing of hillslopes and channels with large boulders in the Virginia Appalachians

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