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The ice continued northward forming the next phase of Lake Chicago. The lake level remained at 640' above sea level, [3] but the ice margin was a third of the way north, opening a channel across Michigan, draining the Lake Saginaw and Lake Whittlesey proglacial lakes in the Lake Huron and Lake Erie basins. [4] Map of Glacial Lakes Duluth ...
Glacial Lake Chicago at the Glenwood Shoreline. The Glenwood Shoreline is an ancient shoreline of the precursor to Lake Michigan, Lake Chicago. It is named after the town of Glenwood, Illinois. The shoreline was formed when the lake was higher during the last ice age, while ice blocked the Straits of Mackinac. After the straits were freed, the ...
The Calumet beach opens into the Chicago outlet, and is 20 feet (6.1 m) or 25 feet (7.6 m) below the Glenwood beach. It stands about 35 feet (11 m) above Lake Michigan at the southern end. [3] Along much of the east and west shores the beach has been eroded by the lake. Along these shores, it is more than 12 miles (19 km) from the lake.
It resulted from a breach of moraines forming a large glacial lake fed by the melting of the Late Wisconsin Laurentide Ice Sheet. The point of origin of the flood was Lake Chicago. [1] The landscape south of Chicago still shows the effects of the torrent, particularly at Kankakee River State Park [2] and on the Illinois River at Starved Rock ...
The clay-rich and pebble-poor till implies that existence of a glacial lake on the margin of the ice. [1] The till mixture predates the Lake Chicago beaches, of which the Glenwood Beach is the oldest and contemporary with the Lake Border Moraine along the Michigan shore.
The retreat of the ice sheet left behind a large amount of meltwater (Lake Algonquin, Lake Chicago, Glacial Lake Iroquois, and Champlain Sea) that filled up the basins that the glaciers had carved, thus creating the Great Lakes as they are today. [56] Because of the uneven nature of glacier erosion, some higher hills became Great Lakes islands ...
The most obvious glacial feature in Illinois is Lake Michigan, the basin of which was carved out by glaciers. [6] As the glaciers receded they left a large number of recessional moraines; among the more visible moraines in the state is the Bloomington Moraine , a Wisconsinan terminal moraine that can be seen in Bureau County .
Chicago's present natural geography is a result of the large glaciers of the Ice Age, namely the Wisconsinan Glaciation that carved out the modern basin of Lake Michigan (which formed from the glacier's meltwater). The city of Chicago itself sits on the Chicago Plain, a flat plain that was once the bottom of ancestral Lake Chicago. This plain ...