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

unknown

Photographs scanned using Epson Expression 1680 scanner at 300 ppi, 8-bit greyscale.

University of Iowa. Dept. of Geoscience. Paleontology Repository

Contact Tiffany Adrain (tiffany-adrain@uiowa.edu) at The University of Iowa Paleontology Repository http://www.uiowa.edu/~geology/paleo

1895/1910

2006-03-02

This digital image may be used for educational purposes, as long as it is not altered in any way. No commercial reproduction or distribution of this file is permitted without permission.

Calvin Geological Photographs

This digital collection contains the geology-related images originally digitized for the Dept. of Geosciences' Calvin web exhibit: http://www.uiowa.edu/~calvin/calvin.htm . Calvin's images of Iowa City can be viewed in the Iowa City Town and Campus Scenes Digital Collection: http://digital.lib.uiowa.edu/ictcs

jpeg

5

7

Still image

Photographs

634

173611416

https://digital.lib.uiowa.edu/