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Allamakee County, Iowa

Posted on June 19th, 2015

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KARST TERRAIN

Karst terrains form by the dissolving of limestone or dolomite by groundwater. Typical features of karst terrains are caves, sinkholes, and springs. Many sinkholes have developed in the Galena Group in Allamakee County. Ludlow Township contains the most sinkholes in the state, with over 3,000 sinkhole identified.

Allamakee County

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