Earth Textures: Patterns in stone

Challenge #2 in the Discovery: New perspecitves on the familiar series. Hosted by ebishop.
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Patterns of geology, rock outcroppings, or even photomicrographs. The earth produces many different kinds of patterns, from columnar jointing to layered strata, and sand dunes. No plants, please, or animals. Just rocks. (Glacial ice, and sand dunes or other sedimentary deposits are also permitted.) No landscape shots--just images that show abstract geologic patterns at any scale.
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Sand waves
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Sand shaped by the sea at Porto Santo island, Portugal.
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Submitted: Tuesday, 18th August, 2009 20:23 (GMT)
Taken: Tuesday, 18th August, 2009
Focal length: 105 mm
Shutter speed: 1/350 sec
Aperture: F8
ISO: 100
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Views: 341
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