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Superimposed Stream / Black Canyon of the Gunnison (Colorado)
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Photographer: Ron Wolf
ID: 0000 0000 1110 1815 (2010-11-26)Copyright © 2010 Ron Wolf
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INFORMATION PROVIDED WITH THE PHOTO
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date of photo Aug 24, 2010
location
Black Canyon of the Gunnison National Park (Gunnison County, Colorado, US)notes View of the canyon and the Gunnison River at sunset looking southest from Tomichi Point. The canyon at this point is about 1800 feet deep. The Gunnison River, which carved this canyon, is a superimposed stream. The course of the river was pushed southward during Oligocene and Miocene time by extensive lava flows originating in the West Elk Range to the north. It reached its present course about 6 million years ago and began downcutting into the Black Canyon Gneiss, a suite of Proterozoic rocks about 1.7 billion years old. The very steep gradient of the river has allowed it to carve this deep canyon across the basement rocks exposed by the Gunnison Uplift.keywords: geology, earth science, geomorphology, metamorphism, erosion, Proterozoic, pegmatite, gneiss, schist, uplift, superimposed stream,
camera Canon 40D, 15mm, f/22, 1.3 sec.
photo category: Misc. - geology
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Using this photo The thumbnail photo (128x192 pixels) on this page may be freely used for personal or academic purposes without prior permission under the Fair Use provisions of US copyright law as long as the photo is clearly credited with © 2010 Ron Wolf.
For other uses, or if you have questions, contact Ron Wolf RonWolf[AT]EyeOnNature.com. (Replace the [AT] with the @ symbol before sending an email.) |
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