Lake Michigan Archipelago

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Presentation transcript:

Lake Michigan Archipelago Erosion is enhanced where glacial flow is parallel to the strike of the formation.

Glacial Tunnel Valleys

Glacial Tunnel Valleys

Lake Michigan Paleolake Levels

Lake Michigan Paleolake Levels

Lake Michigan Paleolake Levels

Lake Michigan Paleolake Levels 9,223 cal. Yrs. ago

In the Post-Algonquin era, lake levels In the Post-Algonquin era, lake levels in the Great Lakes Basin progressively fell due to deglaciation of new, lower outlets to the east. Eventually, the water level in the Lake Michigan Basin reached its lowest elevation, when drainage shifted to the final outlet at North Bay, Ontario, which flowed eastward along the Ottawa River Valley.

This extreme low lake stage is called. Lake Chippewa in the Michigan This extreme low lake stage is called Lake Chippewa in the Michigan Basin. Its correlatives were Lake Stanley in the Huron Basin and Lake Hough in Georgian Bay. Lake Chippewa drained eastward into Lake Stanley, cutting the “Mackinaw channel”.

Mackinaw Channel

Lake Michigan Paleolake Levels

Glacial Isostatic Adjustment (GIA) A process that continues today!

Glacial Isostatic Adjustment (GIA) Tawas 3 cm/century Sault Ste. Marie 21 cm/century

Isostatic rebound evidence Nipissing wave cliff Algonquin 13,000 cal. yrs. 184.4 m Nipissing 6000 cal. yrs. 51.8 m rise in 7000 yrs. Algonquin wave cliffs

The End lusch@msu.edu