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Mirror Lake State Park
Mirror Lake State Park is a Wisconsin state park in the Wisconsin Dells region. It contains Mirror Lake, a narrow reservoir with steep sandstone sides up to tall. The lake has a surface area of and an average depth of . Recessed out of the wind, the water of Mirror Lake is usually calm and often as glassy-smooth as a mirror, hence the name. Situated in a major tourist area, the state park has an extensive campground and other visitor amenities. Also located within the park is the Seth Peterson Cottage, a Frank Lloyd Wright-designed building available for public rental.
==Natural history==
The region is formed from Late Cambrian sandstone deposited 500 million years ago at the bottom of shallow inland seas. During the Wisconsin glaciation between 20,000 and 10,000 years ago a glacial lobe passed just east of the park. Dell Creek, a tributary of the Wisconsin River is believed to have been blocked by outwash sediments and diverted northeast. Over time it cut a deep, narrow ravine into the easily eroded sandstone. The steep cliffs indicate that this section of Dell Creek is much younger geologically than upstream, where the banks have eroded longer and are more gently sloping.
The lakeshore is covered in a pine-oak forest. Eastern white pines are dominant, with red pines clustered atop the sandstone cliffs along the water's edge. The hardwoods are a mix of white, red, and black oaks.
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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