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Ssection through upper part materials in the north valley wall of Helman sand pit. Shows gradation from Iowan aquenous and and silt upward into loess., Iowa City, Iowa, late 1890s or early 1900s
Iowa City, one mile north of, Helman Sand Pit
Ssection through upper part materials in the north valley wall of Helman sand pit. Shows gradation from Iowan aquenous and and silt upward into loess., Iowa City, Iowa, late 1890s or early 1900s
Iowa City, one mile north of, Helman Sand Pit
St. Louis Limestone east of Harvey, Iowa, late 1890s or early 1900s
St. Louis Limestone east of Harvey, Iowa, late 1890s or early 1900s
Steamboat Rock at "Devil's Backbone", Dundee, Iowa, late 1890s or early 1900s
Steamboat Rock at "Devil's Backbone", Dundee, Iowa, late 1890s or early 1900s
Stratified clays in clay pit of Mason City Brick and Tile Works, Mason City, Iowa, late 1890s or early 1900s
Stratified clays in clay pit of Mason City Brick and Tile Works, Mason City, Iowa, late 1890s or early 1900s
Stratified silt below Illinoian Drift, Muscatine, Iowa, late 1890s or early 1900s
Stratified silt below Illinoian Drift, Muscatine, Iowa, late 1890s or early 1900s
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