Glacial imprints of the Okanogan Lobe, southern margin of the Cordilleran Ice Sheet

2004 ◽  
Vol 19 (6) ◽  
pp. 547-565 ◽  
Author(s):  
Dori J. Kovanen ◽  
Olav Slaymaker
Keyword(s):  
Ice Sheet ◽  
Southern Margin ◽  
Cordilleran Ice Sheet

Tephrochronologic Constraints on the Late Pleistocene History of the Southern Margin of the Cordilleran Ice Sheet, Western Washington

1997 ◽  
Vol 47 (2) ◽  
pp. 140-146 ◽  
Author(s):  
James E. Begét ◽  
Mary J. Keskinen ◽  
Kenneth P. Severin
Keyword(s):  
Lake Sediments ◽  
Late Pleistocene ◽  
Ice Sheet ◽  
Cascade Range ◽  
Southern Margin ◽  
Ash Layer ◽  
History Of ◽  
Western Washington ◽  
Cordilleran Ice Sheet ◽  
Eastern Washington

An ash layer that appears geochemically correlative with Mt. St. Helens tephra set S occurs in a sequence of Pleistocene lake sediments in the Ohop Valley of the southern Puget Lowland, below Vashon till deposited during the maximum late Pleistocene advance (Fraser Glaciation) of the Puget Lobe of the Cordilleran Ice Sheet. The Puget Lobe reached its maximum southern extent ca. 14,000–14,500 yr B.P., and at least part of set S is evidently somewhat older. Previous radiocarbon and thermoluminescence dates for set S have ranged from 13,000 to 16,000 yr B.P.Geochemically correlative deposits of set S tephra occur in slackwater sediments coeval with the Missoula Floods in eastern Washington, produced by jökulhlaups through the Purcell Trench Lobe of the Cordilleran Ice Sheet. These relationships suggest that advances of glacier lobes on the southern margin of the Cordilleran Ice Sheet were nonsynchronous, as the Pucell Trench lobe east of the Cascade Range advanced to its maximum southern extent prior to the time of the eruption of set S, before the Puget Lobe west of the Cascades reached its maximum southern extent.

Cordilleran Ice Sheet mass loss preceded climate reversals near the Pleistocene Termination

Science ◽  
2017 ◽  
Vol 358 (6364) ◽  
pp. 781-784 ◽  
Author(s):  
B. Menounos ◽  
B. M. Goehring ◽  
G. Osborn ◽  
M. Margold ◽  
B. Ward ◽  
...  
Keyword(s):  
Mass Loss ◽  
Sea Level Rise ◽  
Sea Level ◽  
Numerical Models ◽  
Ice Sheet ◽  
Younger Dryas ◽  
Climate Dynamics ◽  
Southern Margin ◽  
The Pacific ◽  
Cordilleran Ice Sheet

The Cordilleran Ice Sheet (CIS) once covered an area comparable to that of Greenland. Previous geologic evidence and numerical models indicate that the ice sheet covered much of westernmost Canada as late as 12.5 thousand years ago (ka). New data indicate that substantial areas throughout westernmost Canada were ice free prior to 12.5 ka and some as early as 14.0 ka, with implications for climate dynamics and the timing of meltwater discharge to the Pacific and Arctic oceans. Early Bølling-Allerød warmth halved the mass of the CIS in as little as 500 years, causing 2.5 to 3.0 meters of sea-level rise. Dozens of cirque and valley glaciers, along with the southern margin of the CIS, advanced into recently deglaciated regions during the Bølling-Allerød and Younger Dryas.

NORTHERN CORDILLERAN ICE SHEET DISPLAYS A DIACHRONOUS RESPONSE TO MIS 4 FORCING, YUKON TERRITORY,CANADA

2019 ◽  
Author(s):  
Brent C. Ward ◽  
◽  
Jeffrey D. Bond ◽  
Derek Cronmiller ◽  
Derek Turner ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Yukon Territory ◽  
Cordilleran Ice Sheet

scholarly journals Investigating the glacial history of the northern sector of the Cordilleran Ice Sheet with cosmogenic 10Be concentrations in quartz

2010 ◽  
Vol 29 (25-26) ◽  
pp. 3630-3643 ◽  
Author(s):  
Arjen P. Stroeven ◽  
Derek Fabel ◽  
Alexandru T. Codilean ◽  
Johan Kleman ◽  
John J. Clague ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Glacial History ◽  
History Of ◽  
Cordilleran Ice Sheet ◽  
Cosmogenic 10Be ◽  
Northern Sector
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