Iowa Heritage Digital Collections
State Library of Iowa

Browse Items (748 total) for Calvin Geological Photographs

Observatory from the southeast

Observatory from the southeast

Observatory, Iowa City
Oblique bedding with beds dipping northeast, LeClaire, Iowa, late 1890s or early 1900s

Oblique bedding with beds dipping northeast, LeClaire, Iowa, late 1890s or early 1900s

Located one-half mile south of LeClaire.
Oblique bedding at Sugar Creek lime quarries, Sugar Creek, Iowa, late 1890s or early 1900s

Oblique bedding at Sugar Creek lime quarries, Sugar Creek, 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

North valley wall showing gradation from Iowan aqueous and silts upward into loess one mile north of Helman sand pit, Iowa City, Iowa, late 1890s or early 1900s

North valley wall showing gradation from Iowan aqueous and silts upward into loess one mile north of Helman sand pit, Iowa City, Iowa, late 1890s or early 1900s

North Liberty plain (Iowan Drift Sheet) along the Interurban near Stalwart Station, North Liberty, Iowa, late 1890s or early 1900s

North Liberty plain (Iowan Drift Sheet) along the Interurban near Stalwart Station, North Liberty, Iowa, late 1890s or early 1900s

North fork Yellow River undermining cliff of St. Peter Sandstone at Devil's Den six miles south of Waukon, Iowa, late 1890s or early 1900s

North fork Yellow River undermining cliff of St. Peter Sandstone at Devil's Den six miles south of Waukon, 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

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

Niobrara chalk cliffs near Yankton, S.D., late 1890s or early 1900s

Niobrara chalk cliffs near Yankton, S.D., late 1890s or early 1900s

Niobrara chalk beds of the cement company's works, Yankton, S.D., late 1890s or early 1900s

Niobrara chalk beds of the cement company's works, Yankton, S.D., late 1890s or early 1900s

Output Formats

atom, csv, dcmes-xml, json, omeka-xml, rss2