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Iowa River seen from the bridge at Butler's Landing, Iowa City, Iowa, late 1890s or early 1900s

Iowa River seen from the bridge at Butler's Landing, Iowa City, Iowa, late 1890s or early 1900s

Looks east.
Niobrara chalk beds of the cement company's works, Yankton, S.D., late 1890s or early 1900s

Niobrara chalk beds of the cement company's works, Yankton, S.D., late 1890s or early 1900s

Niobrara chalk cliffs near Yankton, S.D., late 1890s or early 1900s

Niobrara chalk cliffs near Yankton, S.D., late 1890s or early 1900s

Palisades on the Cedar River in winter, Mount Vernon, Iowa, late 1890s or early 1900s

Palisades on the Cedar River in winter, Mount Vernon, Iowa, late 1890s or early 1900s

Iowan geologist J.T. Lonsdale, Iowa, late 1890s or early 1900s

Iowan geologist J.T. Lonsdale, Iowa, late 1890s or early 1900s

Initial steps in the formation of gulches in loess, section 20, Graham Township, Iowa, late 1890s or early 1900s

Initial steps in the formation of gulches in loess, section 20, Graham Township, Iowa, late 1890s or early 1900s

Pleistocene Fauna, fossil horse teeth, superior grinders of Equus scotti found in Cox Pit, Missouri Valley, Iowa, late 1890s or early 1900s

Pleistocene Fauna, fossil horse teeth, superior grinders of Equus scotti found in Cox Pit, Missouri Valley, Iowa, late 1890s or early 1900s

Old green shales bed of the Lower Trenton with natural size Orthis Dlamanella,subeauata, con. and Orthis Tricenaria con, Waukon, Iowa, late 1890s or early 1900s

Old green shales bed of the Lower Trenton with natural size Orthis Dlamanella,subeauata, con. and Orthis Tricenaria con, Waukon, Iowa, late 1890s or early 1900s

Slab of limestone from the Middle Devonian with long winged variety of Spirifer Mucronatus con of natural size, late 1890s or early 1900s

Slab of limestone from the Middle Devonian with long winged variety of Spirifer Mucronatus con of natural size, late 1890s or early 1900s

Near Arkona. Class plate.
Favosites niagarensis, with stems of Amplexus associated with it, Monticello, Iowa, late 1890s or early 1900s

Favosites niagarensis, with stems of Amplexus associated with it, Monticello, Iowa, late 1890s or early 1900s

Located 6 miles southeast of Monticello.