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North face of Interurban cut showing Kansan Drift at bottom, yellow loess at top, and Buchanan Gravels intervening, Iowa City, Iowa, late 1890s or early 1900s

North face of Interurban cut showing Kansan Drift at bottom, yellow loess at top, and Buchanan Gravels intervening, Iowa City, Iowa, late 1890s or early 1900s

Kansan Loess topography near Kansan-Iowan border, Oakdale, Iowa, late 1890s or early 1900s

Kansan Loess topography near Kansan-Iowan border, Oakdale, Iowa, late 1890s or early 1900s

North wall of Iowa River valley, west of Helman sand pit, showing terrace-like feature, Iowa City, Iowa, late 1890s or early 1900s

North wall of Iowa River valley, west of Helman sand pit, showing terrace-like feature, Iowa City, Iowa, late 1890s or early 1900s

Topographic map of the Fairfax quadrangle, Iowa, late 1890s or early 1900s

Topographic map of the Fairfax quadrangle, Iowa, late 1890s or early 1900s

Section (2) of Buchanan Gravels folded and contorted by the Iowan Ice Sheet in the first Interurban cut, Iowa, late 1890s or early 1900s

Section (2) of Buchanan Gravels folded and contorted by the Iowan Ice Sheet in the first Interurban cut, Iowa, late 1890s or early 1900s

Located north of the upper Interurban bridge.
Close view of materials in north face of gully exposure, showing Buchanan gravels at bottom, yellow Loess at top, silt and residual material intervening, Iowa, late 1890s or early 1900s.

Close view of materials in north face of gully exposure, showing Buchanan gravels at bottom, yellow Loess at top, silt and residual material intervening, Iowa, late 1890s or early 1900s.

Located 1/4 mile south of Black Springs.
Wide portion of the Iowa River Valley as seen from the north valley wall above the Upper Interuban Bridge, Iowa, late 1890s or early 1900s

Wide portion of the Iowa River Valley as seen from the north valley wall above the Upper Interuban Bridge, Iowa, late 1890s or early 1900s

Section (3) of Buchanan gravels folded and contorted by the Iowan Ice Sheet in the first Interurban cut, Iowa, late 1890s or early 1900s

Section (3) of Buchanan gravels folded and contorted by the Iowan Ice Sheet in the first Interurban cut, Iowa, late 1890s or early 1900s

Located north of the upper Interurban bridge.
Section (1) of Buchanan Gravels, folded and contorted by the Iowan Ice Sheet in first Interurban cut

Section (1) of Buchanan Gravels, folded and contorted by the Iowan Ice Sheet in first Interurban cut

Iowa City, north of the Upper Interurban Bridge
East ridge bordering the North Liberty Plain near Cemetery Hill, North Liberty, Iowa late 1890s or early 1900s

East ridge bordering the North Liberty Plain near Cemetery Hill, North Liberty, Iowa late 1890s or early 1900s

Located three miles north of North Liberty.