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Base of Redrock Bluff at the east end of Redrock Quarry, Iowa, late 1890s or early 1900s

Base of Redrock Bluff at the east end of Redrock Quarry, Iowa, late 1890s or early 1900s

Crest of redrock sandstone near west end of quarry, Red Rock, Iowa, late 1890s or early 1900s

Crest of redrock sandstone near west end of quarry, Red Rock, Iowa, late 1890s or early 1900s

Cross-bedding in coal measure sandstone, Red Rock, Iowa, late 1890s or early 1900s

Cross-bedding in coal measure sandstone, Red Rock, Iowa, late 1890s or early 1900s

People near Dakota and Benton formations near Old Crills Mill on Sioux River below Westfield, Iowa, late 1890s or early 1900s

People near Dakota and Benton formations near Old Crills Mill on Sioux River below Westfield, Iowa, late 1890s or early 1900s

People near Dakota and Benton formations near Old Crills Mill on Sioux River below Westfield, Iowa, late 1890s or early 1900s

People near Dakota and Benton formations near Old Crills Mill on Sioux River below Westfield, Iowa, late 1890s or early 1900s

Moranic hills of Wisconsin Drift, Iowa, late 1890s or early 1900s

Moranic hills of Wisconsin Drift, Iowa, late 1890s or early 1900s

Located in the northern part of Carroll Co.
Ft. Pierre Shale, Hawarden, Iowa, late 1890s or early 1900s

Ft. Pierre Shale, Hawarden, Iowa, late 1890s or early 1900s

Near Hawarden
Mouth of Lizard Creek, Fort Dodge, Iowa, late 1890s or early 1900s

Mouth of Lizard Creek, Fort Dodge, Iowa, late 1890s or early 1900s

Exposure, showing loess under drift, Afton Junction, Iowa, late 1890s or early 1900s

Exposure, showing loess under drift, Afton Junction, Iowa, late 1890s or early 1900s

People with horse and cart at base of eroded surface of gypsum beds, Fort Dodge, Iowa, late 1890s or early 1900s

People with horse and cart at base of eroded surface of gypsum beds, Fort Dodge, Iowa, late 1890s or early 1900s