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The Great Unconformity
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Photographer: Ron Wolf
ID: 0000 0000 0909 1741 (2009-09-18)Copyright © 2009 Ron Wolf
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INFORMATION PROVIDED WITH THE PHOTO
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date of photo Aug 4, 2009
location
Box Canyon. Ouray (Ouray County, Colorado, 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. The deeply folded quartzite and slate of the precambrian Uncompahgre Formation, seen in the lower half of this photo, was formed about 1.6 billion years ago and was subsequently worn down to a relatively flat plain. About 375 million years ago, the plain was flooded by shallow seas that created the sandstone and shale deposits of the Elbert Formation, now resting horizontally atop the Uncompahgre Formation. The contact between these two units represents a gap of about 1.2 billion years in earth history.keywords: erosion. tectonics, uplift, rock, unconformity, stratigraphy, earth science
camera Canon 40D, 24mm, f/8, 1/320 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 © 2009 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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