The Calumet Shoreline is an ancient shoreline of

Lake Michigan Lake Michigan is one of the five Great Lakes of North America. It is the second-largest of the Great Lakes by volume () and the third-largest by surface area (), after Lake Superior and Lake Huron. To the east, its basin is conjoined with that ...

located in the Lake Michigan Basin. It can be clearly seen as a sand ridge along Ridge Road south of Chicago. Closer to the lake from the Calumet Shoreline, there are the Tolleston shorelines and farther from the lake are the Glenwood Shoreline, the Tinley Moraine, and the Valparaiso Moraine. The shoreline is named after the Calumet Region of Northern Indiana.

Development

The Michigan Lobe of the continental glacier had been stagnant for years, forming the Glenwood Shoreline. Once again, it began a general retreat northwards. The melt waters which formed Glacial Lake Chicago, had more space in which to reside. Then it began to drop. It appears that the outlet to the

Illinois River The Illinois River ( mia, Inoka Siipiiwi) is a principal tributary of the Mississippi River and is approximately long. Located in the U.S. state of Illinois, it has a drainage basin of . The Illinois River begins at the confluence of the ...

, was cutting downward, keeping pace with the lowering lake. At around , it stopped cutting downward and the lake stabilized.''The Indiana Dunes - Legacy of Sand''; Special Report 8; State of Indiana Department of Natural Resources; Geological Survey, John R. Hill, 1974

Features

The Calumet beach opens into the Chicago outlet, and is or below the Glenwood beach. It stands about above

at the southern end.The Pleistocene of Indiana and Michigan, History of the Great Lakes; Monographs of the United States Geological Survey, Vol. LIII; Frank Leverett and Frank B. Taylor; Washington, D.C,; Government Printing Office; 1915; Chapter XIV, Glacial Lake Chicago, F. Leverett Along much of the east and west shores the beach has been eroded by the lake. Along these shores, it is more than from the lake. It takes its name from the Calumet River in northwestern

Indiana Indiana () is a U.S. state in the Midwestern United States. It is the 38th-largest by area and the 17th-most populous of the 50 States. Its capital and largest city is Indianapolis. Indiana was admitted to the United States as the 19th ...

where it is well preserved. On the south shore it is from to from the lakeshore, continuing as far north on the west shore to near Winnetka.

Development

Features

References

See also