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Owl's Head Mountain capped by Oneota Limestone (a hill of circumdenudation over 300 feet high), Iowa, late 1900s or early 1900s

Owl's Head Mountain capped by Oneota Limestone (a hill of circumdenudation over 300 feet high), Iowa, late 1900s or early 1900s

Located in Twp. 99, R.V. Section I, N.W. gr.

Gorge in Trenton Limestone at Pinney's Spring, Iowa, late 1890s or early 1900s

Gorge in Trenton Limestone at Pinney's Spring, Iowa, late 1890s or early 1900s

Located in Twp. 95, R.V. Section 34, S.W. gr. N.W. 1/4.

Glacial planed limestone, west of Clear Creek near the old woolen mill, Iowa City, Iowa, late 1890s or early 1900s

Glacial planed limestone, west of Clear Creek near the old woolen mill, Iowa City, Iowa, late 1890s or early 1900s

Glacial planed pebbles from drift, Iowa City, Iowa, late 1890s or early 1900s

Glacial planed pebbles from drift, Iowa City, Iowa, late 1890s or early 1900s

Aftonian, Kansan Drift, Buchanan gravels, Illinoian Drift, Sangamon sands, and Loess, Muscatine, Iowa, late 1890s or early 1900s

Aftonian, Kansan Drift, Buchanan gravels, Illinoian Drift, Sangamon sands, and Loess, Muscatine, Iowa, late 1890s or early 1900s

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.

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.

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

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

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