Iowa Heritage Digital Collections
State Library of Iowa

Browse Items (1467 total)

Cross-bedding with dark streaks due to glauconite, Lansing, Iowa, late 1890s or early 1900s

Cross-bedding with dark streaks due to glauconite, Lansing, Iowa, late 1890s or early 1900s

Crumbling granite boulder, English Township, Iowa, June 30, 1924

Crumbling granite boulder, English Township, Iowa, June 30, 1924

Located in English Twp., middle of N.W. Section 23.
Crumbling granite boulder, English Township, Iowa, June 30, 1924

Crumbling granite boulder, English Township, Iowa, June 30, 1924

Located in English Twp., middle of N.W. Section 23.
Crumbling granite boulders, English Township, Iowa, June 30, 1924

Crumbling granite boulders, English Township, Iowa, June 30, 1924

Located in English Twp., middle of N.W. quarter, Section 23.
Crumbling granite boulders, English Township, Iowa, June 30, 1924

Crumbling granite boulders, English Township, Iowa, June 30, 1924

Located in English Twp., middle of N.W. quarter, Section 23.
Crystalline rocks overlain by stratified clastic rocks on the mountains seem from the caverns beyond Ute Pass, Manitou, Colo., late 1890s or early 1900s

Crystalline rocks overlain by stratified clastic rocks on the mountains seem from the caverns beyond Ute Pass, Manitou, Colo., late 1890s or early 1900s

Crystalline rocks overlain by stratified clastic rocks on the mountains seem from the caverns beyond Ute Pass, Manitou, Colo., late 1890s or early 1900s

Crystalline rocks overlain by stratified clastic rocks on the mountains seem from the caverns beyond Ute Pass, Manitou, Colo., late 1890s or early 1900s

Dakota Formation with clays and shales, Sioux Paving Brick Company, Riverside, Iowa, late 1890s or early 1900s

Dakota Formation with clays and shales, Sioux Paving Brick Company, Riverside, Iowa, late 1890s or early 1900s

Dakota Formation with clays and shales, Sioux Paving Brick Company, Riverside, Iowa, late 1890s or early 1900s

Dakota Formation with clays and shales, Sioux Paving Brick Company, Riverside, Iowa, late 1890s or early 1900s

Dakota Sandstone cliffs above dam on Coon River, Coon Rapids, Iowa, late 1890s or early 1900s

Dakota Sandstone cliffs above dam on Coon River, Coon Rapids, Iowa, late 1890s or early 1900s

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