A research project, in the Department of Geology at Iowa State College, has as its purpose the investigation of the petrography of Iowa clays and soils. The investigation, at present, is concerned with two loess, subgrade materials which behave differently as roadbeds but are similar as far as ordinary physical tests are concerned. The samples are being subjected to fractionation by a supercentrifuge, complete chemical analyses, X-ray analyses, microscopic study and base exchange determinations. Work, to date, suggests that the colloidal portions of the two materials differ in their mineralogical character; one apparently containing as its principle clay mineral, illite, the other, a mineral of the kaolinite group
Proceedings of the Iowa Academy of Science
©1939 Iowa Academy of Science, Inc.
Cuthbert, F. Leicester
"Petrography of Two Iowa Loess Materials,"
Proceedings of the Iowa Academy of Science, 46(1), 247-248.
Available at: https://scholarworks.uni.edu/pias/vol46/iss1/55