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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

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

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

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

Cross-bedding in St. Louis sandstone, Bellefontaine, Iowa, late 1890s or early 1900s

Cross-bedding in St. Louis sandstone, Bellefontaine, Iowa, late 1890s or early 1900s

Bellafontaine
American Mine, Evans, Iowa, late 1890s or early 1900s

American Mine, Evans, Iowa, late 1890s or early 1900s

Coal Measure Sandstone and shale at foot of Capitol Hill, Des Moines, Iowa, late 1890s or early 1900s

Coal Measure Sandstone and shale at foot of Capitol Hill, Des Moines, Iowa, late 1890s or early 1900s

Coal Measure Shale (middle of picture) resting in eroded channel in St. Louis sandstone (seen in lower corners of picture) on Cedar Creek, Bellefontaine, Iowa, late 1890s or early 1900s.

Coal Measure Shale (middle of picture) resting in eroded channel in St. Louis sandstone (seen in lower corners of picture) on Cedar Creek, Bellefontaine, Iowa, late 1890s or early 1900s.

Elk Cliff with Coal Measure Sandstone on Des Moines River, Rosseau, Iowa, late 1890s or early 1900s

Elk Cliff with Coal Measure Sandstone on Des Moines River, Rosseau, Iowa, late 1890s or early 1900s