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File:Cannonball Concretions in Theodore Roosevelt National Park.jpg

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Cannonball Concretions in Theodore Roosevelt National Park

Summary

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Description
English: In the manner that an oyster lays thin layers around an irritant grain of sand (thereby forming a pearl), calcite builds up around a sand and silt grains (thereby forming a cannonball shaped rock formation).
Date
Source https://www.nps.gov/npgallery/GetAsset/98C0B656-1DD8-B71B-0B41563CC73E416F
Author NPS/Richard Spener

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Public domain This image or media file contains material based on a work of a National Park Service employee, created as part of that person's official duties. As a work of the U.S. federal government, such work is in the public domain in the United States. See the NPS website and NPS copyright policy for more information.

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current05:33, 12 January 2021Thumbnail for version as of 05:33, 12 January 20212,200 × 3,300 (7.27 MB)JulesAltis (talk | contribs)Uploaded a work by NPS/Richard Spener from https://www.nps.gov/npgallery/GetAsset/98C0B656-1DD8-B71B-0B41563CC73E416F with UploadWizard

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