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Local dip in Devonian limestone on Rapid Creek, Graham Township, Iowa, late 1890s or early 1900s

Local dip in Devonian limestone on Rapid Creek, Graham Township, Iowa, late 1890s or early 1900s

Located near center of section 20, Graham Twp.
Anamosa Stage, Niagaran overlain by boulder, and till containing streaks of sand at F. Thielman's Quarry, LeClaire, Iowa, late 1890s or early 1900s

Anamosa Stage, Niagaran overlain by boulder, and till containing streaks of sand at F. Thielman's Quarry, LeClaire, 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

Cascade in winter, Burlington, Iowa, late 1890s or early 1900s

Cascade in winter, Burlington, Iowa, late 1890s or early 1900s

The effects of geologic structure on topographic form within the driftless area. The gently undulating, lower slopes are underlain by Maquoketa Shale, the steep hills in the background are of the overlying Niagaran Limestone. Graf, Iowa, late 1890s or early 1900s

The effects of geologic structure on topographic form within the driftless area. The gently undulating, lower slopes are underlain by Maquoketa Shale, the steep hills in the background are of the overlying Niagaran Limestone. Graf, Iowa, late 1890s or early 1900s

Located south from Lattner's, near Graf.
Maquoketa River and east side of ""Devil's Backbone,"" with a ridge of Niagaran Limestone, Dundee, Iowa, late 1890s or early 1900s.

Maquoketa River and east side of ""Devil's Backbone,"" with a ridge of Niagaran Limestone, Dundee, Iowa, late 1890s or early 1900s.

Located in Twp. 90, R. VI, Section 16.
Moline quarry on Shakerag Creek north of Le Claire, Iowa, late 1890s or early 1900s

Moline quarry on Shakerag Creek north of Le Claire, Iowa, late 1890s or early 1900s

Ledge of Niagaran limestone in Loop's Quarry, Hopkinton, Iowa, late 1890s or early 1900s.

Ledge of Niagaran limestone in Loop's Quarry, Hopkinton, Iowa, late 1890s or early 1900s.

Devonian dolomite in quarry north of bridge, Forreston, Iowa, late 1890s or early 1900s

Devonian dolomite in quarry north of bridge, Forreston, Iowa, late 1890s or early 1900s

Quarry in Devonian dolomite near the Oneota River north of the bridge, Forreston, Iowa, late 1890s or early 1900s

Quarry in Devonian dolomite near the Oneota River north of the bridge, Forreston, Iowa, late 1890s or early 1900s