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Carboniferous sandstone cliffs near Boneyard Hollow in Dolliver Memorial State Park, Lehigh, Iowa, late 1890s or early 1900s

Carboniferous shale, Mena, Ark., late 1890s or early 1900s

Located east of Mena, Arkansas.

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

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

Outcropping, Winterset, Iowa, late 1890s or early 1900s

Located along the road south from Winterset.

Hertha Limestone located about 200 feet west of Iron Bridge and south of Squaw Creek, Osceola Township, Iowa, late 1890s or early 1900s

Located in Osceolo Twp., about 200 feet West of Iron Bridge, South of Squaw Creek, in the NW 1/4 of the NW 1/4 of section 6.

Bethany Falls Milestone, Clarke County, Iowa, late 1890s or early 1900s

Ward Twp., SE 1/4 of the NE 1/4 of section 2

Dark brownish sandstone, Lewis, Iowa, late 1890s or early 1900s

Located on the east side of the road one mile south of Lewis.

Outcropping, Winterset, Iowa, late 1890s or early 1900s

Located along the road south from Winterset.

Hertha Limestone located about 200 feet west of Iron Bridge and south of Squaw Creek, Osceola Township, Iowa, late 1890s or early 1900s

Located in Osceolo Twp., about 200 feet West of Iron Bridge, South of Squaw Creek, in the NW 1/4 of the NW 1/4 of section 6.

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