An updated radiocarbon-based ice margin chronology for the last deglaciation of the North American Ice Sheet Complex

Dalton, Andrew; Margold, Martin; Stokes, Chris R.; Tarasov, Lev; Dyke, Arthur S.; Adams, Roberta S.; Allard, Serge; Arends, Heather E.; Atkinson, Nigel; Attig, John W.; Barnett, Peter J.; Barnett, Robert L.; Batterson, Martin J.; Bernatchez, Pascal; Borns, Harold W.; Breckenridge, Andy; Briner, Jason P.; Brouard, Étienne; Campbell, J E; Carlson, Anders E.; Clague, John J.; Curry, B. Brandon; Daigneault, Robert André; Dubé-Loubert, Hugo; Easterbrook, Don J.; Franzi, David A.; Friedrich, Hannah G.; Funder, Svend; Gauthier, Michelle; Gowan, Angela S.; Harris, Ken L.; Hétu, Bernard; Hooyer, Tom S.; Jennings, Carrie E.; Johnson, Mark D.; Kehew, Alan E.; Kelley, Samuel E.; Kerr, D E; King, E.L.; Kjeldsen, Kristian K.; Knaeble, Alan R.; Lajeunesse, Patrick; Lakeman, Thomas R.; Lamothe, Michel; Larson, Phillip H.; Lavoie, Martin; Loope, Henry M.; Lowell, Thomas V.; Lusardi, B.A.; Manz, Lorraine; McMartin, I; Nixon, F. Chantel; Occhietti, Serge; Parkhill, Michael A.; Piper, David J. W.; Pronk, Antonius G.; Richard, Pierre J. H.; Ridge, John C.; Ross, Martin; Roy, Martin; Seaman, Allen A.; Shaw, John; Stea, Rudolph R.; Teller, James T.; Thompson, Woodrow B; Thorleifson, Harvey; Utting, D J; Veillette, J J; Ward, Brent; Weddle, Thomas K; Wright, H. E.

doi:10.1016/j.quascirev.2020.106223

Cited by 270 publications

(304 citation statements)

References 206 publications

(340 reference statements)

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“…This type of semi-floating, glacial ice-shelf advance might not produce a typical basal till texture that would be readily identifiable in small-diameter, split-spoon core samples. These findings also demonstrate that the ice during the B-A episode retreated north of the current Lake Ontario southern shoreline prior to the proposed B-A/YD advance (Dalton et al 2020). Such a sequence of events also is consistent with the ice advance during the existence of Lake Iroquois as inferred by Calkin et al (1982).…”

Section: Irondequoit Bay Barrier Sandbar Boringssupporting

confidence: 87%

Evidence for a late glacial advance near the beginning of the Younger Dryas in western New York State: An event postdating the record for local Laurentide ice sheet recession

et al. 2020

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Widespread evidence of an unrecognized late glacial advance across preexisting moraines in western New York is confirmed by 40 14C ages and six new optically stimulated luminescence analyses between the Genesee Valley and the Cattaraugus Creek basin of eastern Lake Erie. The Late Wisconsin chronology is relatively unconstrained by local dating of moraines between Pennsylvania and Lake Ontario. Few published 14C ages record discrete events, unlike evidence in the upper Great Lakes and New England. The new 14C ages from wood in glacial tills along Buttermilk Creek south of Springville, New York, and reevaluation of numerous 14C ages from miscellaneous investigations in the Genesee Valley document a significant glacial advance into Cattaraugus and Livingston Counties between 13,000 and 13,300 cal yr B.P., near the Greenland Interstadial 1b (GI-1b) cooling leading into the transition from the Bölling-Alleröd to the Younger Dryas. The chronology from four widely distributed sites indicates that a Late Wisconsin advance spread till discontinuously over the surface, without significantly modifying the preexisting glacial topography. A short-lived advance by a partially grounded ice shelf best explains the evidence. The advance, ending 43 km south of Rochester and a similar distance south of Buffalo, overlaps the revised chronology for glacial Lake Iroquois, now considered to extend from ca. 14,800–13,000 cal yr B.P. The spread of the radiocarbon ages is similar to the well-known Two Creeks Forest Bed, which equates the event with the Two Rivers advance in Wisconsin.

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Section: Irondequoit Bay Barrier Sandbar Boringssupporting

confidence: 87%

Evidence for a late glacial advance near the beginning of the Younger Dryas in western New York State: An event postdating the record for local Laurentide ice sheet recession

et al. 2020

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“…The use of radiocarbon dating can only be useful for deglacial phases associated with ice margin retreat (e.g. Dalton et al ., 2020), which means it is of limited use in the study area. Flow 1 (Figure 4A) likely occurred at a time when the LIS was thick over the study area, as the ice‐flow features associated with this ice‐flow phase are remarkably parallel and appear to be unaffected by topography.…”

Section: Introductionmentioning

confidence: 99%

A GIS‐based multi‐proxy analysis of the evolution of subglacial dynamics of the Quebec–Labrador ice dome, northeastern Quebec, Canada

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Ross

Paulen

et al. 2020

Earth Surf Processes Landf

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The glacial records of the inner-core regions of the Laurentide Ice Sheet (LIS) document complex yet coherent patterns reflecting ice-sheet change (e.g. ice-divide migration), providing unique insights into past glacial conditions. This study develops a conceptual model of subglacial dynamics evolution within a major ice-dispersal centre of the LIS in northeastern Quebec, Canada using a GIS-based analysis of the surficial geologic record. Multiple proxies of subglacial conditions (subglacial streamlined landforms, lake density and lake area over thin drift/bedrock) were analysed through grid-overlay techniques and then classified based on different proxy variables ranging from highly mobile warm-based to immobile cold-based conditions. An additional proxy (till blanket) was used to identify areas of thick till deposition, but with few proxies (few lake or landform metrics). Based on local ice-flow reconstructions, the most 'relict' glacial terrain zone (GTZ1) has warm-based conditions over 66% of its area and is remarkably well preserved, suggesting laterally extensive warm-based conditions during the oldest identified ice-flow phase. This relict glacial terrain is partially overprinted by two subsequent ice-flow phases in spatially restricted zones in the northeast (73% warmbased), east-central (41% warm-based), and northwest (33% warm-based) of the study area. A zone of more sluggish conditions (only 3% warm-based) was identified in the highlands at the centre of the study area, characterized by thin till cover, few landforms, yet with large patches of relatively abundant small lakes, indicative of areal scouring. No clear evidence of sustained cold-based conditions (i.e. high chemical index of alteration values or high 10 Be abundances) was found in the study area. These results suggest that warm-based conditions (active erosion and/or deposition) were uniformly widespread during the earliest ice-flow phase, later becoming more spatially restricted with broader sluggish ice conditions. These spatially restricted regions of warm-based subglacial regimes were likely controlled by surrounding and down-flow ice streaming.

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“…Reconstructions of the history of Lake Agassiz have concluded that the lake had drained away by ~8.4 ka (Klassen, 1983; Barber et al, 1999; Dyke, 2004; Dalton et al, 2020), although there is evidence that this drainage spanned several centuries (e.g. Klassen, 1983; Teller et al, 2002; Clarke et al, 2004; Gauthier et al, 2020; Godbout et al, 2020).…”

Section: New Osl Data and Interpretationmentioning

confidence: 99%

Age of Gimli beach of Lake Agassiz based on new OSL dating

Teller

Owen

2020

J Quaternary Science

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Gimli beach in Manitoba is one of the lowest elevation beaches in the southern Lake Agassiz basin, and is a distinct ridge composed of bedded sand and gravel that rises above the lake plain and extends for more than 40 km. Ten new optically stimulated luminescence (OSL) ages from Gimli beach yield ages mostly ranging from 9.7 ± 0.7 to 10.5 ± 0.8 ka (average 10.3 ± 0.5 ka), which is older by 0.6 to >1.0 ka than age estimates of previous researchers. Two of our new OSL ages are notably older than the others, dating to~11.3 ± 0.8 and 13.9 ± 1.0 ka, which we attribute to poorly bleached sands. We ascribe an age of about 10 ka to Gimli beach, which is several centuries before overflow from Lake Agassiz and its vast drainage basin shifted from the western Great Lakes to glacial Lake Ojibway and the St. Lawrence Valley.

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An updated radiocarbon-based ice margin chronology for the last deglaciation of the North American Ice Sheet Complex

Cited by 270 publications

References 206 publications

Evidence for a late glacial advance near the beginning of the Younger Dryas in western New York State: An event postdating the record for local Laurentide ice sheet recession

Evidence for a late glacial advance near the beginning of the Younger Dryas in western New York State: An event postdating the record for local Laurentide ice sheet recession

A GIS‐based multi‐proxy analysis of the evolution of subglacial dynamics of the Quebec–Labrador ice dome, northeastern Quebec, Canada

Age of Gimli beach of Lake Agassiz based on new OSL dating

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