“The Black Canyon of the Gunnison's unique and
spectacular landscape was formed slowly by the action of water and
rock scouring down through hard Proterozoic crystalline
rock.
No other canyon in North America combines the narrow opening, sheer walls, and startling depths offered by the Black Canyon of the Gunnison.”
甘尼逊黑峡谷国家公园网页:http://www.nps.gov/blca/index.htm
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