Evidence for high glacial-lake levels in the northeastern Lake Michigan basin and their relation to the Glenwood and Calumet phases of glacial Lake Chicago

1990 ◽  
pp. 91-110 ◽  
Author(s):  
Lawrence D. Taylor
Keyword(s):  
Lake Michigan ◽  
Glacial Lake ◽  
Michigan Basin ◽  
Lake Levels

Glacial-Lake Outburst Erosion of the Grand Valley, Michigan, and Impacts on Glacial Lakes in the Lake Michigan Basin

1993 ◽  
Vol 39 (1) ◽  
pp. 36-44 ◽  
Author(s):  
Alan E. Kehew
Keyword(s):  
Lake Level ◽  
Lake Michigan ◽  
Laurentide Ice Sheet ◽  
Glacial Lake ◽  
Michigan Basin ◽  
Lake Agassiz ◽  
Lake Algonquin ◽  
Lake Michigan Lobe ◽  
Possible Cause ◽  
Glacial Lake Algonquin

AbstractGeomorphic and sedimentologic evidence in the Grand Valley, which drained the retreating Saginaw Lobe of the Laurentide Ice Sheet and later acted as a spillway between lakes in the Huron and Erie basins and in the Michigan basin, suggests that at least one drainage event from glacial Lake Saginaw to glacial Lake Chicago was a catastrophic outburst that deeply incised the valley. Analysis of shoreline and outlet geomorphology at the Chicago outlet supports J H Bretz's hypothesis of episodic incision and lake-level change. Shoreline features of each lake level converge to separate outlet sills that decrease in elevation from the oldest to youngest lake phases. This evidence, coupled with the presence of boulder lags and other features consistent with outburst origin, suggests that the outlets were deepened by catastrophic outbursts at least twice. The first incision event is correlated with a linked series of floods that progressed from Huron and Erie basin lakes to glacial Lake Saginaw to glacial Lake Chicago and then to the Mississippi. The second downcutting event occurred after the Two Rivers Advance of the Lake Michigan Lobe. Outbursts from the eastern outlets of glacial Lake Agassiz to glacial Lake Algonquin are a possible cause for this period of downcutting at the Chicago outlets.

Deglaciation, lake levels, and meltwater discharge in the Lake Michigan basin

1994 ◽  
Vol 13 (9-10) ◽  
pp. 879-890 ◽  
Author(s):  
S.M. Colman ◽  
J.A. Clark ◽  
L. Clayton ◽  
A.K. Hansel ◽  
C.E. Larsen
Keyword(s):  
Lake Michigan ◽  
Michigan Basin ◽  
Lake Levels

Constraining Holocene lake levels and coastal dune activity in the Lake Michigan basin

2010 ◽  
Vol 47 (3) ◽  
pp. 373-390 ◽  
Author(s):  
Timothy G. Fisher ◽  
Kelly A. Weyer ◽  
Amber M. Boudreau ◽  
James M. Martin-Hayden ◽  
David E. Krantz ◽  
...  
Keyword(s):  
Lake Michigan ◽  
Coastal Dune ◽  
Michigan Basin ◽  
Lake Levels ◽  
Dune Activity

Evidence for the Two Creeks interstade in the Lake Huron basin

1994 ◽  
Vol 31 (5) ◽  
pp. 793-797 ◽  
Author(s):  
Grahame J. Larson ◽  
Thomas V. Lowell ◽  
Nathaniel E. Ostrom
Keyword(s):  
Lake Michigan ◽  
Lake Huron ◽  
Glacial Lake ◽  
Michigan Basin ◽  
Radiocarbon Age ◽  
Lake Algonquin ◽  
Major Implication ◽  
Straits Of Mackinac ◽  
Continuous Deposition ◽  
Glacial Lake Algonquin

New radiocarbon age dates for the Cheboygan bryophyte bed in northern lower Michigan indicate that the bed was not deposited during the Mackinaw interstade, as was previously proposed, but is correlative to the Two Creeks forest bed deposited during the Two Creeks interstade approximately 11 850 BP. Furthermore, the till overlying the bryophyte bed does not represent continuous deposition by ice throughout the Two Creeks interstade, as proposed by others, but represents deposition during the Greatlakean stade. A major implication resulting from the reassignment of the age of the Cheboygan bryophyte bed is that the Straits of Mackinac could have been ice free during the Two Creeks interstade and that during that time the Kirkfield phase of glacial Lake Algonquin may have extended into the Lake Michigan basin.

An analysis of the late glacial lake levels within the western Lake Superior basin based on digital elevation models

2013 ◽  
Vol 80 (3) ◽  
pp. 383-395 ◽  
Author(s):  
Andy Breckenridge
Keyword(s):  
Lake Michigan ◽  
Digital Elevation Models ◽  
Lake Superior ◽  
Late Glacial ◽  
Glacial Lake ◽  
Lake Levels ◽  
Lake Agassiz ◽  
Western Lake ◽  
Digital Elevation ◽  
Ice Retreat

This study establishes a detailed lake-level history for the Lake Superior basin by mapping strandlines from 10-m and 3-m digital elevation models. There are 24 levels above the mid-Holocene Nipissing level, and elevations increase along a direction of 23.1° due to post-glacial rebound. The highest level, the Epi-Duluth, is steeper than subsequent levels and may pre-date the Lake View ice advance into the western Lake Superior basin at the end of the Younger Dryas stade. The most prominent level is the Duluth, ca. 10,800 cal yr BP. Ice retreat exposed successively lower outlets, routing overflow to the Lake Michigan and Huron basins. By 10,600 cal yr BP, lake levels in the western Superior basin had dropped almost 200 m. This transformative period is complicated by multiple basin-wide events: the influx of glacial Lake Agassiz overflow, the creation of three sub-aqueous moraines, and a red to gray color transition in basin sediments. A later drawdown event has been hypothesized to have initiated the 9300 cal yr BP cooling event, but this flood was much smaller than estimated previously. If freshwater triggered the 9300 cal yr BP event, the source of the water must have been Lake Agassiz, not Lake Superior.

Forest canopy disturbance geospatial data for Lake Michigan basin, USA, 1985-2008

2014 ◽  
Author(s):  
Ian W. Housman ◽  
Mark D. Nelson ◽  
Charles H. Perry ◽  
Kirk M. Stueve ◽  
Chengquan Huang
Keyword(s):  
Forest Canopy ◽  
Lake Michigan ◽  
Geospatial Data ◽  
Michigan Basin ◽  
Canopy Disturbance

Paleohydrology of the upper Laurentian Great Lakes from the late glacial to early Holocene

2009 ◽  
Vol 71 (3) ◽  
pp. 397-408 ◽  
Author(s):  
Andy Breckenridge ◽  
Thomas C. Johnson
Keyword(s):  
Great Lakes ◽  
Lake Michigan ◽  
Lake Superior ◽  
Late Glacial ◽  
Lake Huron ◽  
Michigan Basin ◽  
Great Lakes Basin ◽  
Lake Agassiz ◽  
Sharp Drop ◽  
Freshwater Fluxes

AbstractBetween 10,500 and 9000 cal yr BP, δ18O values of benthic ostracodes within glaciolacustrine varves from Lake Superior range from − 18 to − 22‰ PDB. In contrast, coeval ostracode and bivalve records from the Lake Huron and Lake Michigan basins are characterized by extreme δ18O variations, ranging from values that reflect a source that is primarily glacial (∼ − 20‰ PDB) to much higher values characteristic of a regional meteoric source (∼ − 5‰ PDB). Re-evaluated age models for the Huron and Michigan records yield a more consistent δ18O stratigraphy. The striking feature of these records is a sharp drop in δ18O values between 9400 and 9000 cal yr BP. In the Huron basin, this low δ18O excursion was ascribed to the late Stanley lowstand, and in the Lake Michigan basin to Lake Agassiz flooding. Catastrophic flooding from Lake Agassiz is likely, but a second possibility is that the low δ18O excursion records the switching of overflow from the Lake Superior basin from an undocumented northern outlet back into the Great Lakes basin. Quantifying freshwater fluxes for this system remains difficult because the benthic ostracodes in the glaciolacustrine varves of Lake Superior and Lake Agassiz may not record the average δ18O value of surface water.

scholarly journals On deglaciation-induced perturbations of the geoid

1986 ◽  
Vol 23 (2) ◽  
pp. 269-272 ◽  
Author(s):  
Detlef Wolf
Keyword(s):  
Theoretical Model ◽  
Glacial Lake ◽  
Lake Levels

The importance of geoid perturbations in interpreting tilts of glacial lake levels is investigated, using a representative theoretical model. It is shown that near the ice margin, the slope of the Earth's perturbed surface is everywhere large compared with the slope of the associated undulation of the geoid. Perturbations of the geoid may therefore be neglected in interpretations of glacial strandline tilt.

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