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"Granddad Formation" inside Niagara Cave

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Photograph of "Granddad Formation" Niagara Cave

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The "Granddad Formation" inside Niagara Cave, Harmony, Minnesota, ca. 2010s. Used with the permission of Niagara Cave.

© Niagara Cave

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Made possible by the Arts and Cultural Heritage Fund through the vote of Minnesotans on November 4, 2008. Administered by the Minnesota Historical Society.
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