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Quarry in Devonian limestone, Cedar Valley Stage, showing two parallel joints, Iowa City, Iowa, late 1890s or early 1900s
Quarry in Devonian limestone, Cedar Valley Stage, showing two parallel joints, Iowa City, Iowa, late 1890s or early 1900s
Quarry in Devonian Limestone, near Iron Bridge, northwest of North Liberty, Iowa, late 1890s or early 1900s
Located in Twp. 81, R. VII, Section 22
Quarry in Devonian Limestone, near Iron Bridge, northwest of North Liberty, Iowa, late 1890s or early 1900s
Located in Twp. 81, R. VII, Section 22
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
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
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
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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