Strandline analysis in the southern basin of glacial Lake Agassiz, Minnesota and North and South Dakota, USA

2005 ◽  
Vol 117 (11) ◽  
pp. 1481 ◽  
Author(s):  
Timothy G. Fisher
Keyword(s):  
South Dakota ◽  
Glacial Lake ◽  
Lake Agassiz ◽  
Southern Basin ◽  
Glacial Lake Agassiz ◽  
North And South

A Chronology for glacial Lake Agassiz shorelines along Upham's namesake transect

2013 ◽  
Vol 80 (1) ◽  
pp. 88-98 ◽  
Author(s):  
Kenneth Lepper ◽  
Alex W. Buell ◽  
Timothy G. Fisher ◽  
Thomas V. Lowell
Keyword(s):  
Water Level Fluctuations ◽  
Glacial Lake ◽  
Lake Agassiz ◽  
Data Set ◽  
Southern Basin ◽  
Glacial Lake Agassiz ◽  
Static Water ◽  
Paleoclimate Records ◽  
Age Constraints ◽  
Osl Age

Four traditionally recognized strandline complexes in the southern basin of glacial Lake Agassiz are the Herman, Norcross, Tintah and Campbell, whose names correspond to towns in west-central Minnesota that lie on a linear transect defined by the Great Northern railroad grade; the active corridor for commerce at the time when Warren Upham was mapping and naming the shorelines of Lake Agassiz (ca.1880–1895). Because shorelines represent static water planes, their extension around the lake margin establishes time-synchronous lake levels. Transitions between shoreline positions represent significant water-level fluctuations. However, geologic ages have never been obtained from sites near the namesake towns in the vicinity of the southern outlet. Here we report the first geologic ages for Lake Agassiz shorelines obtained at field sites along the namesake transect, and evaluate the emerging chronology in light of other paleoclimate records. Our current work from 11 sampling sites has yielded 16 independent ages. These results combined with a growing OSL age data set for Lake Agassiz's southern basin provide robust age constraints for the Herman, Norcross and Campbell strandlines with averages and standard deviations of 14.1 ± 0.3 ka, 13.6 ± 0.2 ka, and 10.5 ± 0.3 ka, respectively.

Postglacial Diatom Stratigraphy in Relation to the Recession of Glacial Lake Agassiz

1975 ◽  
Vol 5 (4) ◽  
pp. 529-540 ◽  
Author(s):  
J.C. Ritchie ◽  
L.K. Koivo
Keyword(s):  
Sandy Beach ◽  
Sedimentary Environment ◽  
Glacial Lake ◽  
Lake Agassiz ◽  
Organic Detritus ◽  
Sedimentary Environments ◽  
Grand Rapids ◽  
Glacial Lake Agassiz ◽  
Diatom Stratigraphy ◽  
Beach Sands

The sediment and diatom stratigraphy of a small pond on The Pas moraine, near Grand Rapids, Manitoba, reveals a change in sedimentary environment related directly to the last stages of Glacial Lake Agassiz. Beach sands were replaced by clay 7300 14C y. a., then by organic silt and, at 4000 14C y. a. by coarse organic detritus; the corresponding diatom assemblages were (I) a predominantly planktonic spectrum in beach sands, (II) a rich assemblage of nonplanktonic forms, and (III) a distinctly nonplanktonic acidophilous spectrum. These results confirm Elson's (1967) reconstruction of the extent and chronology of the final (Pipun) stage of Glacial Lake Agassiz. The sedimentary environments change from a sandy beach of a large lake at 7300 BP to a small, shallow eutrophic pond with clay and silt deposition from 7000 to 4000 BP. From 4000 BP to the present, organic detritus was deposited in a shallow pond that tended toward dystrophy.

Micromorphology of iceberg scour in clays: Glacial Lake Agassiz, Manitoba, Canada

2012 ◽  
Vol 55 ◽  
pp. 125-144 ◽  
Author(s):  
Lorna D. Linch ◽  
Jaap J.M. van der Meer ◽  
John Menzies
Keyword(s):  
Glacial Lake ◽  
Lake Agassiz ◽  
Glacial Lake Agassiz ◽  
Iceberg Scour

Thunder Bay, Ontario, was not a pathway for catastrophic floods from Glacial Lake Agassiz

2012 ◽  
Vol 260 ◽  
pp. 98-105 ◽  
Author(s):  
E.B. Voytek ◽  
S.M. Colman ◽  
N.J. Wattrus ◽  
J.L. Gary ◽  
C.F.M. Lewis
Keyword(s):  
Glacial Lake ◽  
Lake Agassiz ◽  
Thunder Bay ◽  
Glacial Lake Agassiz
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