County: Pottawatomie

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Photographer: John Charlton/KGS

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Short description: Sandstone concretion in Pottawatomie County. Concretions are masses of mineral matter embedded within rock layers, including limestone, sandstone, and shale. Generally, concretions are harder than the rocks around them and, over time, may weather out when the softer rock erodes away.

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Credit: This photo may be reproduced for non-commercial and educational purposes. When using this photo in a publication, website, or presentation, please credit Kansas Geological Survey. For information about use for commercial purposes, please contact the KGS editor.