The Fort Dodge gypsum is considered the purest gypsum on earth. Gypsum is a mineral (calcium sulfate) mined in the region since the 1850s. The outcrop here is a section that has not been mined. Gypsum typical forms from evaporation of ocean water in an isolated basin.
References
Page 68 - Dicka, A. B., 2012, 101 American Geo-sites you've gotta see: Mountain Press Publishing Co., 250p.
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