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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 ...
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 ...
In Indiana the crest ranges from 750 feet (230 m) in Lake County to nearly 900 feet (270 m) in LaPorte County. The Michigan section is 670 feet (200 m) to 800 feet (240 m) in near the St. Joseph River and north to the Allegan and Van Buren county line. In Allegan County the moraine has its greatest variation.
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 ...
The Tinley Moraine begins as an offshoot of the Valparaiso Moraine in southern Lake County, Illinois, in the kettle lake region around Lake Zurich and follows the eastern crest southward through Des Plaines, Illinois, and Argonne National Laboratory, where it is broken by the Chicago Sanitary and Ship Canal, then sweeping southeast towards Dyer ...
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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.