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Projecting block of Galena Limestone, receptaculites horizon 60 feet below top of Galena located southeast of Rockville, Iowa, late 1890s or early 1900s
Projecting block of Galena Limestone, receptaculites horizon 60 feet below top of Galena located southeast of Rockville, Iowa, late 1890s or early 1900s
Quarry in Galena Limestone, Dubuque, Iowa, late 1890s or early 1900s
Quarry in Galena Limestone, Dubuque, Iowa, late 1890s or early 1900s
Quarry in Galena Limestone, Twin Springs, Iowa, late 1890s or early 1900s
Quarry in Galena Limestone, Twin Springs, Iowa, late 1890s or early 1900s
Quarry of Saint Croix overlain by Oneota limestone, Harpers Ferry, Iowa, late 1890s or early 1900s
Quarry is about 100 feet above base of bluff in Oneota.
Quarry of Saint Croix overlain by Oneota limestone, Harpers Ferry, Iowa, late 1890s or early 1900s
Quarry is about 100 feet above base of bluff in Oneota.
Railroad cut through Maquoketa Shales, Graf, Iowa, late 1890s or early 1900s
Located north of Graf.
Railroad cut through Maquoketa Shales, Graf, Iowa, late 1890s or early 1900s
Located north of Graf.
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