The Toleston Shoreline is the third ancient shoreline of the precursor to Lake Michigan, Lake Chicago. It takes its name from the village of Tolleston, now a portion of Gary, Indiana. The shoreline formed when Lake Chicago was high enough to drain through the Chicago outlet into the Des Plaines River. The beach is 18 to 25 feet (5.5 to 7.6 m) above the level of Lake Michigan. The Indiana segment and the Illinois segment, north to Evanston are still visible. North of Evanston and Michigan City, Indiana, the beach has been eroded by later ice movement or shoreline wave action.
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| - The Toleston Shoreline is the third ancient shoreline of the precursor to Lake Michigan, Lake Chicago. It takes its name from the village of Tolleston, now a portion of Gary, Indiana. The shoreline formed when Lake Chicago was high enough to drain through the Chicago outlet into the Des Plaines River. The beach is 18 to 25 feet (5.5 to 7.6 m) above the level of Lake Michigan. The Indiana segment and the Illinois segment, north to Evanston are still visible. North of Evanston and Michigan City, Indiana, the beach has been eroded by later ice movement or shoreline wave action. (en)
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| - Muskegon County, Michigan
- Des Plaines River
- Holland, Michigan
- Pentwater, Michigan
- Oceana County, Michigan
- Ottawa County, Michigan
- Gary, Indiana
- Grand River (Michigan)
- Muskegon, Michigan
- Ludington, Michigan
- Calumet Shoreline
- Geological history of the Great Lakes
- Straits of Mackinac
- White River (White Lake)
- Glacial landforms
- Evanston, Illinois
- Lake Michigan
- Glenwood Shoreline
- Kankakee Outwash Plain
- Kalamazoo River
- Lake Chicago
- Lake Michigan
- Tinley Moraine
- Manistee, Michigan
- Port Huron, Michigan
- St. Joseph, Michigan
- Michigan City, Indiana
- Mason County, Michigan
- Valparaiso Moraine
- dbr:Bowmanville,_Illinois
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| - The Toleston Shoreline is the third ancient shoreline of the precursor to Lake Michigan, Lake Chicago. It takes its name from the village of Tolleston, now a portion of Gary, Indiana. The shoreline formed when Lake Chicago was high enough to drain through the Chicago outlet into the Des Plaines River. The beach is 18 to 25 feet (5.5 to 7.6 m) above the level of Lake Michigan. The Indiana segment and the Illinois segment, north to Evanston are still visible. North of Evanston and Michigan City, Indiana, the beach has been eroded by later ice movement or shoreline wave action. The Toleston beach appeared to be present at Holland, Michigan, at the eastern end of Black Lake, being built out between the lake and the marsh, which extends east from Holland a short distance. It is there built up to a height of 21 to 22.5 feet (6.4 to 6.9 m) above Lake Michigan, as shown by Goldthwait's levels. From Holland it seems likely to have continued northward to the Grand River, but as that region is extensively covered with sand blown from the modern shore the beach is largely concealed. In Springport, Goldthwait's levels show the beach to be about 21 feet (6.4 m) above Lake Michigan. From the Grand River it appears to run northwestward, passing just east of Little Black Lake on the line of Muskegon and Ottawa counties and coming to the shore of Lake Michigan directly west of the north end of the lake. There is probably no point between Holland and the Grand River where its distance from the present shore exceeds six miles (9.7 km), and throughout much of the distance it probably does not exceed two or three miles (3.2 or 4.8 km). (en)
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