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Cannonball Concretion A sandstone and clay pillar that has been eroded by rain and wind holds up a round, fist-sized rock made of scoria. Captured in the North Unit of Teddy Roosevelt National Park, North Dakota. Geotagged,North Dakota,Theodore Roosevelt National Park,United States Click/tap to enlarge Promoted

Cannonball Concretion

A sandstone and clay pillar that has been eroded by rain and wind holds up a round, fist-sized rock made of scoria. Captured in the North Unit of Teddy Roosevelt National Park, North Dakota.

    comments (3)

  1. How bizarre. It looks to be a matter of time before the rock starts rolling, right? Posted 11 years ago
    1. I assume you are correct. After enough erosion has occurred, it should roll right off and into the valley. Here is some information on the geological formations found within this area.

      http://www.nps.gov/thro/naturescience/geologicformations.htm
      Posted 11 years ago
    2. I assume you are correct. After enough erosion has occurred, it should roll right off and into the valley. Here is some information on the geological formations found within this area.

      http://www.nps.gov/thro/naturescience/geologicformations.htm
      Posted 11 years ago

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By travismorhardt

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Uploaded Mar 10, 2014. Captured Mar 9, 2014 14:48 in Scenic Drive, Theodore Roosevelt National Park, Grassy Butte, ND 58634, USA.
  • TG-830
  • f/11.0
  • 10/1600s
  • ISO125
  • 5mm