State Library of Iowa
Copyright and Ownership
Welcome to the Iowa Heritage Digital Collections
Collection Development Policy
Digitization Resources for participants in the Iowa Heritage Digital Collections
Steps to Participation
Collection: Calvin Geological Photographs
Browse Items (748 total) for Calvin Geological Photographs
Browse by Tag
Jointed structure in Carboniferous sandstone, Montpelier, Iowa, late 1890s or early 1900s
Julien Dubuque Monument made of Galena Limestone, Dubuque, Iowa, late 1890s or early 1900s
Kames, Thornton, Iowa, late 1890s or early 1900s
Located northwest of Thornton.
Kansan gumbotil covered with Iowan till with background of Iowan constructional topography; Windsor Township, Iowa, July 10, 1924
View looking southeast of Section 16.
Kansan gumbotil overlain by Peorian loess, Oregon Township, Iowa, August 1933
Oregon Twp., NW 1/4, section 34
Kansan gumbotil with Illinoian till above on Miller Farm, Washington Township, Iowa, July 10, 1925
Located on Miller Farm in Washington Twp., SW 1/4, section 28 on the east side of the railroad tracks.
Kansan gumbotil with Iowa topography in the background, Massilon Township, Iowa, July 18, 1925
Located in Massilon Twp. sections 30 and 31.
Kansan gumbotil with Iowan till above, gumbotil line marked by cleared area and field bag, Wayne Township, Iowa, July 08, 1924
Located in Wayne Twp. near middle of north line of Section 30. View looking southwest.
Kansan gumbotil with Iowan till above, Lincoln Township, Iowa, June 24, 1925
Located in Lincoln Twp. south of line between sections 34 and 35.
Kansan gumbotil, Lincoln Township, Iowa, June 21, 1925
Located in Lincoln Twp., SW 1/4, section 11.