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The Great Unconformity / Grand Canyon National Park
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Photographer: Ron Wolf
ID: 0000 0000 0612 1073 (2012-06-17)Copyright © 2012 Ron Wolf
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INFORMATION PROVIDED WITH THE PHOTO
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date of photo May 25, 2012
location
Blacktail Canyon. Grand Canyon National Park (Coconino County, Arizona, US)notes 'The Great Unconformity' is a vast geological feature extending across several states in the Southwest. It is the evidence of an ancient land surface created by more than a billion years of erosion. It is particularly well exposed at the bottom of the Grand Canyon. At this outcrop in Blacktail Canyon, the Tapeats Sandstone of Cambrian age rests unconfomably upon the Vishnu Schist, formed about 1.75 billion years ago. The contact between these two units represents a gap of about 1.2 billion years in the geological record of earth history.keywords: Geology, Earth Science, erosion, deposition, unconformity, Proterozoic, Cambrian
camera Canon EOS Rebel T3i, 24mm, f/7.1, 1/50 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 © 2012 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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