The Calumet Shoreline is an ancient shoreline of Lake Michigan 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.Kenneth J. Schoon, Calumet Beginnings, 2003
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, 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 Lake Michigan 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 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.
References
See also Ridge Road Calumet Region Geography of Indiana -glacial feature from north to south of Lake Michigan Glenwood Shoreline Calumet Shoreline Tolleston Shoreline Tinley Moraine Valparaiso Moraine Kankakee Outwash Plain