File:Cannon Ball Concretion Theodore Roosevelt National Park.jpg

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English: Concretion rock formation — in Theodore Roosevelt National Park, North Dakota.
  • This boulder is known as a "concretion". The concretions are formed within sedementary rocks such as shale or sandstone. They form as minerals are deposited around a core. As the surrounding rocks erode, the "cannon balls" become exposed.
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Author M. Readey

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current18:43, 18 November 2011Thumbnail for version as of 18:43, 18 November 20111,473 × 1,104 (794 KB)Circa24 (talk | contribs)

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