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Initial steps in the formation of gulches in loess, Graham Township, Iowa, late 1890s or early 1900s

Initial steps in the formation of gulches in loess, Graham Township, Iowa, late 1890s or early 1900s

Located in section 20 of Graham Township.

Initial steps in the formation of gulches in loess, Graham Township, Iowa, late 1890s or early 1900s

Initial steps in the formation of gulches in loess, Graham Township, Iowa, late 1890s or early 1900s

Located in section 20 of Graham Township.

Illinoian gumbotil plain, Fort Madison, Iowa, June 21, 1924

Illinoian gumbotil plain, Fort Madison, Iowa, June 21, 1924

Located in Washington Twp., S.E. quarter Section 33. Photographed from the edge of bluffs above Fort Madison.

Illinoian gumbotil plain, Fort Madison, Iowa, June 21, 1924

Illinoian gumbotil plain, Fort Madison, Iowa, June 21, 1924

Located in Washington Twp., S.E. quarter Section 33. Photographed from the edge of bluffs above Fort Madison.

Illinoian gumbotil plain in foreground, level upland beyond Mississippi River, Washington Township, Iowa, June 21, 1924

Illinoian gumbotil plain in foreground, level upland beyond Mississippi River, Washington Township, Iowa, June 21, 1924

View from north of Mississippi River in Washington Twp., S.E. quarter Section 33.

Illinoian gumbotil plain in foreground, level upland beyond Mississippi River, Washington Township, Iowa, June 21, 1924

Illinoian gumbotil plain in foreground, level upland beyond Mississippi River, Washington Township, Iowa, June 21, 1924

View from north of Mississippi River in Washington Twp., S.E. quarter Section 33.

Illinoian boulders, late 1890s or early 1900s

Illinoian boulders, late 1890s or early 1900s

Illinoian boulders, late 1890s or early 1900s

Illinoian boulders, late 1890s or early 1900s

Hills of Kansan drift, Belle Plaine, Iowa, late 1890s or early 1900s

Hills of Kansan drift, Belle Plaine, Iowa, late 1890s or early 1900s

Hills of Kansan drift, Belle Plaine, Iowa, late 1890s or early 1900s

Hills of Kansan drift, Belle Plaine, Iowa, late 1890s or early 1900s

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