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Cannonball Concretions in the Frontier Sandstone
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Photographer: Ron Wolf
ID: 0000 0000 0910 1184 (2010-09-16)Copyright © 2010 Ron Wolf
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INFORMATION PROVIDED WITH THE PHOTO
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date of photo Sep 4, 2010
location
Diamond Mountain Plateau. Near Vernal (Uintah County, Utah, US)notes These large spheres are masses of limestone that were precipitated from groundwater when calcium carbonate crystallized around a central nucleus. Once begun, the concretions grew incrementally as more limestone formed around the initial core. The concretions are harder than the sediments that contain them and are exposed when the surrounding material erodes away. The Frontier formation is a limy sandstone deposited in mid-Cretaceous time, about 95 million years ago.keywords: petrology, geology, earth science, sedimentary
camera Canon 40D, 24mm, f/10, 1/160 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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