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National Bison Range
The National Bison Range (NBR) is a National Wildlife Refuge located in western Montana established in 1908 to provide a sanctuary for the American bison. The NBR is one of the oldest National Wildlife Refuges in the United States. The size of the bison herd at the NBR is relatively small, numbering between 350 and 500 individuals. The initial herd of American bison was provided by organizations such as the American Bison Society, and today the refuge serves as the central point for bison research in the United States.
The NBR consists of approximately and is managed by the U.S. Fish and Wildlife Service. Other nearby National Wildlife Refuges are managed as parts of the National Bison Range Complex and include the Lost Trail, Ninepipe, Pablo and the Swan River National Wildlife Refuges. Also affiliated is the Northwest Montana Wetland Management District.
The NBR has a visitor center, and two scenic roads that allow vehicular access to prime viewing areas. The refuge is approximately one hour north of Missoula, Montana with signs off of U.S. Highway 93 directing visitors to the entrance at Moiese, Montana, and the refuge headquarters.
==Geology==
The Refuge is essentially a small, low-rolling mountain connected to the Mission Mountain Range by a gradually descending spur. Range elevation varies from 2,585 feet at headquarters to 4,885 feet at High Point on Red Sleep Mountain, the highest point on the Range. Much of the National Bison Range was once under prehistoric Glacial Lake Missoula, which was formed by a glacial ice dam on the Clark Fork River about 13,000 to 18,000 years ago. The lake attained a maximum elevation of 4,200 feet, so the upper part of the Refuge was above water. Old beach lines are still evident on north-facing slopes. Topsoil on the Range is generally shallow and mostly underlain with rock which is exposed in many areas, forming ledges and talus slopes. Soils over the major portion of the Range were developed from materials weathered from strongly folded pre-Cambrian quartzite and argillite bedrock.〔About the Refuge, March 12, 2013, viewed November 6, 2013, U.S. Fish and Wildlife Service, http://www.fws.gov/refuge/National_Bison_Range/about.html〕
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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