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Willard Bacon's homestead below a Valley cut in St. Croix sandstone, Iowa, late 1890s or early 1900s
Mineral Creek valley cut in Oneota limestone, Iowa, late 1890s or early 1900s
Located in Twp. 99, R. VI, Section 14.
Vermilya's Bluff above the Shell Rock River, Cedar Valley, Iowa, late 1890s or early 1900s
Champion Quarries, Stone City, Iowa, late 1890s or early 1900s
Rock formation in Wildcat Den State Park, Muscatine, Iowa, late 1890s or early 1900s
Willow Creek near Parker's Mill, Mason City, Iowa, late 1890s or early 1900s
Outcropping, Winterset, Iowa, late 1890s or early 1900s
Located along the road south from Winterset.
Undercutting of Gower limestone on Wapsipinicon River, Massillon, Iowa, late 1890s or early 1900s
Upper Coal Measure Limestone, Earlham, Iowa, late 1890s or early 1900s
Typical development of coal measures shale in the coal pit of Iowa Pipe and Tile Works, Des Moines, Iowa, late 1890s or early 1900s
Geological Survey
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