Iowa Heritage Digital Collections
State Library of Iowa

Browse Items (1467 total)

Shore forms are results of wave erosion, Calif., late 1890s or early 1900s

Shore forms are results of wave erosion, Calif., late 1890s or early 1900s

Sixty foot high bluff of Oneota (massive above) with cherty partings at base, Iowa, late 1890s or early 1900s

Sixty foot high bluff of Oneota (massive above) with cherty partings at base, Iowa, late 1890s or early 1900s

Located in the R.W. Section 16, S.W. gr., N.E. 1/4.
Sixty foot high bluff of Oneota (massive above) with cherty partings at base, Iowa, late 1890s or early 1900s

Sixty foot high bluff of Oneota (massive above) with cherty partings at base, Iowa, late 1890s or early 1900s

Located in the R.W. Section 16, S.W. gr., N.E. 1/4.
Sketch of the Geology of Iowa

Sketch of the Geology of Iowa

Sketch of the Geology of Iowa. Issued by the Iowa Geological Survey.
Sketch of the Geology of Iowa

Sketch of the Geology of Iowa

Sketch of the Geology of Iowa. Issued by the Iowa Geological Survey.
Slab of Devonian limestone with long winged spirifer beds, late 1890s or early 1900s

Slab of Devonian limestone with long winged spirifer beds, late 1890s or early 1900s

Near Arkona.
Slab of Devonian limestone with long winged spirifer beds, late 1890s or early 1900s

Slab of Devonian limestone with long winged spirifer beds, late 1890s or early 1900s

Near Arkona.
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.
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.
Small gorge in Devonian limestone, Solon, Iowa, late 1890s or early 1900s

Small gorge in Devonian limestone, Solon, Iowa, late 1890s or early 1900s

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