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Collection: Calvin Geological Photographs
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Map of Iowa marked with x on the locations of Kansan gumbotil exposures, Iowa, late 1890s or early 1900s
Map of Iowa showing by density of pattern the relative resistances of various areas of rock to erosion, Iowa, late 1890s or early 1900s
Map of Iowa showing the distribution of the Drift sheets, Iowa, late 1890s or early 1900s
Map of Iowa with triangles marking the localtions of Nebraskan gumbotil and crosses marking Kansan gumbotil locations, Iowa, late 1890s or early 1900s
Map of northeastern Iowa with dashed line showing locations of an old drift in patches east of margin of Kansan drift, 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.
Maquoketa River and pine covered bluffs on the west side of "Devil's Backbone", Dundee, Iowa, late 1890s or early 1900s
Maquoketa shales, Graf, Iowa, late 1890s or early 1900s
Mason City Brick and Tile Company seen from northeast, Mason City, Iowa, late 1890s or early 1900s
Mass of limestone which crept down slopes over whole thickness of shales and fallen over cliff of Galena to end up 60 feet below the top of the Galena above the Little Maquoketa River, Iowa, late 1890s or early 1900s
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