Superior National Forest - Landforms

Landforms

The forest covers 3.9 million acres (6,100 mi2 or 16,000 km2), and has over 445,000 acres (1,800 km2) of water. Its waters include some 2000 lakes and rivers, more than 1,300 miles (2,100 km) of cold water streams, and 950 miles (1,530 km) of warm water streams. Many of the lakes are located in depressions formed by the diffential erosion of tilted layers of bedded rock; these depressions were given their final form by glacial scouring during recent ice ages.

The forest is located on part of the Canadian Shield. The area is on a low plateau which is part of the Superior Upland. High points include the Sawtooth Mountains, a range of hills along the shore of Lake Superior, the Misquah Hills including Eagle Mountain, the state's highest point, and other uplands along the Laurentian Divide separating the watershed of the Great Lakes and Atlantic Ocean from that of Hudson Bay and the Arctic Ocean. Despite the presence of dramatic cliffs and other local differences in elevation, the area is essentially flat, as it is part of an old peneplain eroded by weathering, water, and especially glaciers.

The principal surficial result of recent glaciation is not the deposition of glacial drift (unlike most of the rest of the state), but the remodeling of the landscape by the scraping away of softer surfaces down to bare hard rock. The land therefore is raw, with many outcroppings of ancient bedrock, overlain in places by thin layers of gravelly soil and, in the west, silts deposited by Glacial Lake Agassiz.