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click photo for larger file
Talus pile of basalt showing columnar jointing
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Photographer: Ron Wolf
ID: 0000 0000 1009 0996 (2009-10-13)Copyright © 2009 Ron Wolf
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INFORMATION PROVIDED WITH THE PHOTO
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date of photo Oct 9, 2009
location
Devil's Postpile National Monument (Madera County, California, US)notes Talus pile at base of an outcrop of basalt showing columnar jointing. These unusual, symmetrical columns of basalt were formed by joints that developed when a river of molten lava contracted as it cooled. The flow occurred nearly 100,000 years ago.keywords: basalt, volcanism, jointing, Pleistocene, Quaternary, Cenozoic, Sierra, earth science, geology
camera Canon 40D, 50mm, f/7.1, 1/80 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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