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Mass of limestone which crept down slopes over whole thickness of shales and fallen over cliff of Galena to end up 60 feet below the top of the Galena above the Little Maquoketa River, Iowa, late 1890s or early 1900s
Lower quarry beds, Twin Springs, Iowa, late 1890s or early 1900s
Quarry with lower quarry beds of Niagaran, Farley, Iowa, late 1890s or early 1900s
The effects of geologic structure on topographic form within the driftless area. The gently undulating, lower slopes are underlain by Maquoketa Shale, the steep hills in the background are of the overlying Niagaran Limestone. Graf, Iowa, late 1890s or early 1900s
Located south from Lattner's, near Graf.
Basal ledges, Washington Mills, Iowa, late 1890s or early 1900s
Blocks from basal ledges, creeping down slopes of Maquoketa Shales, Epworth, Iowa, late 1890s or early 1900s
Located north of Epworth.
Top picture: Dodgeville peneplain at an elevation of 1260 ft., Asbury, Iowa, 1920s. Bottom picture: Lancaster peneplain northeast of Waukon, Iowa, 1920s
Goldthorpe's Zinc Mine, Durango, Iowa, late 1890s or early 1900s
Weathered face of Galena Limestone near Walter's Furnace, Dubuque, Iowa, late 1890s or early 1900s
Walter's smelter, Dubuque, Iowa, late 1890s or early 1900s
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