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Spearfish Canyon
Spearfish Canyon is a deep but narrow gorge carved by Spearfish Creek just south of Spearfish, South Dakota in the U.S. It is located on the northern edge of Black Hills National Forest. Many tourists drive through the canyon, drawn to the region due to its wide range of plant and wildlife, geology, rock formations, and waterfalls. Spearfish Creek holds populations of rainbow and brown trout and is dammed in several spots, affording fishing opportunities. Stocking of trout in Spearfish Creek was discontinued in the 1970s and all trout in the creek today are wild. In addition, remnants of Spearfish Canyon's active mining history are still easily found in some locations.
==Natural history==
Approximately 600 million years ago in the Precambrian, the area was covered by a sea. As waters subsided and land masses began to appear 60 to 30 million years ago (between the Paleocene and Oligocene epochs), drainages such as Spearfish Canyon formed as softer rock was eroded away. Today, a National Scenic Byway, U.S. Highway 14A, winds through the canyon. This area is truly a crossroads, and trees and plants from Rocky Mountains, eastern woodlands, northern forests, and the Great Plains areas can be found here.
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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