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Nordhouse Dunes Wilderness
The Nordhouse Dunes Wilderness is a listed wilderness area within the Manistee National Forest. It is located north of Ludington, Michigan, and is best known for its 4 miles (6.4 km) of undeveloped Lake Michigan shoreline.
==Geology==
The lake levels of the upper Great Lakes have fluctuated sharply over the past 4,000 years, with a temporary high-water mark, the Nipssing stage, achieved about 3,500 years before the present. During the Nipissing stage, Lake Huron and Lake Michigan were interconnected as they are today, but the two lakes brimmed over with fresh water 605 feet (184 m) above sea level. As the lakes fell back toward their current level of 580 feet (177 m) above sea level, large quantities of sand were exposed. Subsequent work by lake-effect winds shaped this exposed sand into sand dunes.
The Lake Michigan sand-dune shoreline around Big Sable Point was reshaped into the Big Sable Dunes complex, a 6,270-acre (25.4 km²) area of sandy hills, dunal moraines, shallow lakes, and associated plant and animal life. The dunes reach heights of 140 feet (42 m) above lake level.
The Nordhouse Dunes form the northern half of the preserved section of the Big Sable Dunes complex. The southern 2,820 acres (11.4 km²) are contained within Michigan's Ludington State Park.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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