This report is the fourth in a series of papers dealing with depth variations in the engineering properties of Wisconsin-age loess in Iowa. Previous studies have included graduation and in-place density (Davidson, et. al. 1953), clay and carbonate contents (Handy and Davidson, 1956), and organic matter, manganese and iron contents (Daniels et. al. 1960). This paper discusses the variation of the Coulomb shear strength parameters c (cohesive shear strength) and ø (angle of internal friction) in the loess in a cut located in N. W. 1/4 Sec. 3, T77N, R44W, Harrison County, Iowa. This cut was described in detail and proposed as a new type section for the Loveland formation by Daniels and Handy (1959). In general, the hill and cut consist of approximately 130 feet of post-Farmdale loess, over 12 feet of Farmdale loess, over 20 feet of Loveland loess, over oxidized calcareous Kansan (?) till. The upper 30 feet of loess is not cut and was not included in the description by Daniels et. al. (1959). Below this, the upper 40' of the cut has a slope of 50 per cent, and the lower 90 feet is cut into three near-vertical benches.
Proceedings of the Iowa Academy of Science
©1966 Iowa Academy of Science, Inc.
Fox, N. S.; Lohnes, R. A.; and Handy, R. L.
"Depth Studies of Wisconsin Loess in Southwestern Iowa: IV. Shear Strength,"
Proceedings of the Iowa Academy of Science, 73(1), 198-205.
Available at: https://scholarworks.uni.edu/pias/vol73/iss1/31