Age verification of the Lake Gribben forest bed and the Younger Dryas Advance of the Laurentide Ice Sheet

1999 ◽  
Vol 36 (3) ◽  
pp. 383-393 ◽  
Author(s):  
Thomas V Lowell ◽  
Graham J Larson ◽  
John D Hughes ◽  
George H Denton
Keyword(s):  
Lake Superior ◽  
Ice Sheet ◽  
Younger Dryas ◽  
Laurentide Ice Sheet ◽  
Climatic Forcing ◽  
Glacier System ◽  
Stratigraphic Position ◽  
Age Verification ◽  
Younger Dryas Event ◽  
Age Estimates

Analysis of nine wood samples from the Lake Gribben forest bed near Lake Gribben, Michigan, yielded a combined age of 10 025 ± 100 14C years BP, which confirms and refines prior age estimates for the bed. The stratigraphic position of these samples below a prograding ice-contact fan indicates the time that a glacial margin reached the southern edge of the Lake Superior basin. Geomorphic tracing and correlation of associated deposits indicate that a contemporaneous margin extended almost 1000 km from Duluth, Minnesota, across the Lake Superior basin to North Bay, Ontario. Along the southern shore of Lake Superior ice-margin expansion began during and ended at the close of the Younger Dryas. A surging glacier system would not produce a nearly linear moraine system across both a major basin (Lake Superior) and a major upland (Abitibi Upland). Therefore, we attribute this advance of the Laurentide Ice Sheet to climatic forcing of the Younger Dryas event.

scholarly journals Deglaciation and ice shelf development at the northeast margin of the Laurentide Ice Sheet during the Younger Dryas chronozone

Boreas ◽  
2017 ◽  
Vol 47 (1) ◽  
pp. 271-296 ◽  
Author(s):  
Mark F. A. Furze ◽  
Anna J. Pieńkowski ◽  
Morgan A. McNeely ◽  
Robbie Bennett ◽  
Alix G. Cage
Keyword(s):  
Ice Sheet ◽  
Younger Dryas ◽  
Laurentide Ice Sheet ◽  
Ice Shelf

scholarly journals Routing of meltwater from the Laurentide Ice Sheet during the Younger Dryas cold episode

Nature ◽  
1989 ◽  
Vol 341 (6240) ◽  
pp. 318-321 ◽  
Author(s):  
Wallace S. Broecker ◽  
James P. Kennett ◽  
Benjamin P. Flower ◽  
James T. Teller ◽  
Sue Trumbore ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Younger Dryas ◽  
Laurentide Ice Sheet ◽  
Cold Episode

scholarly journals Younger Dryas Interval and outflow from the Laurentide Ice Sheet

2000 ◽  
Vol 15 (1) ◽  
pp. 4-18 ◽  
Author(s):  
T. C. Moore ◽  
J. C. G. Walker ◽  
D. K. Rea ◽  
C. F. M. Lewis ◽  
L. C. K. Shane ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Younger Dryas ◽  
Laurentide Ice Sheet

Environment and paleoecology of a 12 ka mid-North American Younger Dryas forest chronicled in tree rings

2008 ◽  
Vol 70 (3) ◽  
pp. 433-441 ◽  
Author(s):  
Irina P. Panyushkina ◽  
Steven W. Leavitt ◽  
Todd A. Thompson ◽  
Allan F. Schneider ◽  
Todd Lange
Keyword(s):  
Tree Ring ◽  
Lake Michigan ◽  
Black Spruce ◽  
Ice Sheet ◽  
Younger Dryas ◽  
Laurentide Ice Sheet ◽  
Tree Ring Chronology ◽  
Water And Sediment ◽  
Ice Floes ◽  
Insight Into

AbstractUntil now, availability of wood from the Younger Dryas abrupt cooling event (YDE) in N. America ca. 12.9 to 11.6 ka has been insufficient to develop high-resolution chronologies for refining our understanding of YDE conditions. Here we present a multi-proxy tree-ring chronology (ring widths, “events” evidenced by microanatomy and macro features, stable isotopes) from a buried black spruce forest in the Great Lakes area (Liverpool East site), spanning 116 yr at ca. 12,000 cal yr BP. During this largely cold and wet period, the proxies convey a coherent and precise forest history including frost events, tilting, drowning and burial in estuarine sands as the Laurentide Ice Sheet deteriorated. In the middle of the period, a short mild interval appears to have launched the final and largest episode of tree recruitment. Ultimately the tops of the trees were sheared off after death, perhaps by wind-driven ice floes, culminating an interval of rising water and sediment deposition around the base of the trees. Although relative influences of the continental ice sheet and local effects from ancestral Lake Michigan are indeterminate, the tree-ring proxies provide important insight into environment and ecology of a N. American YDE boreal forest stand.

Optical ages on loess derived from outwash surfaces constrain the advance of the Laurentide Ice Sheet out of the Lake Superior Basin, USA

2014 ◽  
Vol 81 (2) ◽  
pp. 318-329 ◽  
Author(s):  
Randall J. Schaetzl ◽  
Steven L. Forman ◽  
John W. Attig
Keyword(s):  
Lake Superior ◽  
Ice Sheet ◽  
River Valley ◽  
Laurentide Ice Sheet ◽  
West Central ◽  
Glacial Chronology ◽  
Osl Age

AbstractWe present textural and thickness data on loess from 125 upland sites in west-central Wisconsin, which confirm that most of this loess was derived from the sandy outwash surfaces of the Chippewa River and its tributaries, which drained the Chippewa Lobe of the Laurentide front during the Wisconsin glaciation (MIS 2). On bedrock uplands southeast of the widest outwash surfaces in the Chippewa River valley, this loess attains thicknesses > 5 m. OSL ages on this loess constrain the advance of the Laurentide ice from the Lake Superior basin and into west-central Wisconsin, at which time its meltwater started flowing down the Chippewa drainage. The oldest MAR OSL age, 23.8 ka, from basal loess on bedrock, agrees with the established, but otherwise weakly constrained, regional glacial chronology. Basal ages from four other sites range from 13.2 to 18.5 ka, pointing to the likelihood that these sites remained geomorphically unstable and did not accumulate loess until considerably later in the loess depositional interval. Other OSL ages from this loess, taken higher in the stratigraphic column but below the depth of pedoturbation, range to nearly 13 ka, suggesting that the Chippewa River valley may have remained a loess source for several millennia.

scholarly journals Correction to “Cryosphere/Ocean Interactions at the Margin of the Laurentide Ice Sheet during the Younger Dryas Chron: SE Baffin Shelf, Northwest Territories”

1991 ◽  
Vol 6 (2) ◽  
pp. 291-291 ◽  
Author(s):  
J. T. Andrews ◽  
L. W. Evans ◽  
K. M. Williams ◽  
W. M. Briggs ◽  
A. J. T. Jull ◽  
...  
Keyword(s):  
Northwest Territories ◽  
Ice Sheet ◽  
Younger Dryas ◽  
Laurentide Ice Sheet

scholarly journals Late Wisconsin Advance and Retreat Pattern in the Miami Sublobe, Laurentide Ice Sheet

1990 ◽  
Vol 14 ◽  
pp. 172-175 ◽  
Author(s):  
Thomas V. Lowell ◽  
Robert Stuckenrath
Keyword(s):  
Climatic Change ◽  
Ice Sheet ◽  
Laurentide Ice Sheet ◽  
Maximum Extent ◽  
Southern Margin ◽  
Radiometric Ages ◽  
A Site ◽  
Age Estimates

Ice-sheet advance and retreat chronologies reflect climatic change in a manner that is difficult to decipher. Especially difficult is the placement of records into a chronologic sequence. Multiple age estimates obtained from three stratigraphic positions at a site in Ohio show that organics within deposits of the Miami sublobe, along the southern margin of the Laurentide ice sheet, may be up to 3000 years older than the age of the maximum Late Wisconsin extension of that sublobe. In addition, recent studies on organic accumulations above glacial drift provide bracketing ages for ice recession. When the existing radiometric ages for the Miami sublobe are interpreted with these new radiometric constraints, several fluctuations suggested by prior workers are unsupported. A simpler chronology for the Miami sublobe suggests that in late Wisconsin time the southern margin of the Laurentide ice sheet advanced through Ohio about 22 ka to its maximum extent at 19.7 and remained near there until 15 ka. This is in agreement with newly-refined stratigraphic histories of other Laurentide lobes.

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