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Unconformity between Carboniferous and Devonian, Montpelier, Iowa, late 1890s or early 1900s

Unconformity between Carboniferous and Devonian, Montpelier, Iowa, late 1890s or early 1900s

Concretionary structure in Carboniferous near Prairie Creek, Iowa, late 1890s or early 1900s

Concretionary structure in Carboniferous near Prairie Creek, Iowa, late 1890s or early 1900s

Men by conglomerate basal with lentils of unconformity near base, Montpelier, Iowa, late 1890s or early 1900s

Men by conglomerate basal with lentils of unconformity near base, Montpelier, Iowa, late 1890s or early 1900s

Exposure of Upper Coal Measures and Carboniferous, Hawleyville, Iowa, late 1890s or early 1900s

Exposure of Upper Coal Measures and Carboniferous, Hawleyville, Iowa, late 1890s or early 1900s

Falls in Carboniferous forms on Indian Spring, Burlington, Iowa, late 1890s or early 1900s

Falls in Carboniferous forms on Indian Spring, Burlington, Iowa, late 1890s or early 1900s

Jointed structure in Carboniferous sandstone, Montpelier, Iowa, late 1890s or early 1900s

Jointed structure in Carboniferous sandstone, Montpelier, Iowa, late 1890s or early 1900s

Carboniferous outlier, Iowa City, Iowa, late 1890s or early 1900s

Carboniferous outlier, Iowa City, Iowa, late 1890s or early 1900s

Cavern in Carboniferous sandstone, Wild Cat Den State Park, Iowa, late 1890s or early 1900s

Cavern in Carboniferous sandstone, Wild Cat Den State Park, Iowa, late 1890s or early 1900s

Outlier of Carboniferous sandstone, Iowa City, Iowa, late 1890s or early 1900s

Outlier of Carboniferous sandstone, Iowa City, Iowa, late 1890s or early 1900s

Coal Measure Shale, Fort Dodge, Iowa, late 1890s or early 1900s

Coal Measure Shale, Fort Dodge, Iowa, late 1890s or early 1900s