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Leaf scars of Lepidodendron, Carboniferous, late 1890s or early 1900s

Leaf scars of Lepidodendron, Carboniferous, late 1890s or early 1900s

Leaf scars of Lepidodendron, Carboniferous, late 1890s or early 1900s

Leaf scars of Lepidodendron, Carboniferous, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Fish teeth found in Old State Quarry beds, North Liberty, Iowa, late 1890s or early 1900s

Willow Creek near Parker's Mill, Mason City, Iowa, late 1890s or early 1900s

Willow Creek near Parker's Mill, Mason City, Iowa, late 1890s or early 1900s

Ravine, Winterset, Iowa, late 1890s or early 1900s

Ravine, Winterset, Iowa, late 1890s or early 1900s

Located southwest of Winterset.

Fossil bearing beds of Upper Devonian or Hackberry clay banks, Iowa, late 1890s or early 1900s

Fossil bearing beds of Upper Devonian or Hackberry clay banks, Iowa, late 1890s or early 1900s

Bluff above Turkey Creek on the Iowa River, Iowa, late 1890s or early 1900s

Bluff above Turkey Creek on the Iowa River, Iowa, late 1890s or early 1900s

Iowa River and bluff above Turkey Creek, Iowa City, Iowa, late 1890s or early 1900s

Iowa River and bluff above Turkey Creek, Iowa City, Iowa, late 1890s or early 1900s

Quarry, Olin, Iowa, late 1890s or early 1900s

Quarry, Olin, Iowa, late 1890s or early 1900s