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.
10-576: 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 620 feet (190 m), it stopped cutting downward and
20-524: A stable lake formed. The Glenwood beach is the highest of the Lake Chicago beaches. In the Wisconsin it lies close to the shore of Lake Michigan. To the north, it has been destroyed by Lakes Nipissing and Algonquin and modern Lake Michigan . Southward into Illinois the remnants are broken, until the area of Winnetka . From here south, the beach is further inland a nearly continuous around
30-675: 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 lake receded and left behind a sand ridge at an elevation of about 640 feet (200 m) where the shore resided. This ridge can be seen clearly in Glenwood, Illinois, Dyer, Indiana , and Schererville, Indiana , all south of Chicago . The two higher beaches of Lake Chicago,
40-524: The Calumet River in northwestern Indiana where it is well preserved. On the south shore it is from 1 mile (1.6 km) to 8 miles (13 km) from the lakeshore, continuing as far north on the west shore to near Winnetka . -glacial feature from north to south of Lake Michigan 41°33′42″N 87°30′40″W / 41.56167°N 87.51111°W / 41.56167; -87.51111 Glenwood Shoreline The Glenwood Shoreline
50-668: The Grand and Muskegon valleys and can be from 6 miles (9.7 km) to 20 miles (32 km) from the lake. When the beach reaches10 miles (16 km) north of the Muskegon River it returns to the shore of Lake Michigan. North of this area, the beach ridge has been eroded away. Near Pentwater it remains several miles from modern shore. Around Ludington it is buried by a gravel plain. The beach name comes from Glenwood, Illinois . Beginning in Dyer, Indiana , along U.S. Route 30 ,
60-584: The Glenwood and the Calumet , are not visible along the northern part of the Lake Michigan. The readvance of ice lobe may have buried or eroded any northern remains. The Michigan Lobe of the continental glacier had been growing and receding since 70,000 BCE. The glacier had been static along the Valparaiso Moraine for many years before it again began to recede northward. Around 12,000 BCE
70-582: The beach continues eastward from where U.S. 30 bends southward just east of U.S. 41 . Just north of downtown Merrillville it ends. The next segment can be found west of State Route 51 in Hobart , along the southern flank of Deep River . Leaving Lake County, the beach turns northward. The next visible area is along Salt Creek in Porter County . It is visible on the northern bank from just north of I-80/90, southward across State Route 149. The largest area
80-474: The city of Chicago into Indiana . It is continuous through Chesterton and then north into Michigan, where it follows the west edge of Covert Ridge into Holland . The ridge is part of the Lake Border Moraine . The beach reaches back more than 2 miles (3.2 km) from the modern shoreline while in other places, the modern lake as eroded the old beach shore. North of Holland it passes through
90-483: The glacier began receding north of the Valparaiso Moraine. The melt waters began to form a lake between the southern front of the glacier and the moraine, which acted as a dam. The water collected until it found a low spot in the moraine, near modern Palos Hills, Illinois . Here, it topped the moraine and began cutting an outlet. At around 640 feet (200 m) above sea level, it stopped cutting downward and
100-518: The lake stabilized. 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. 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 takes its name from
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