Several Wisconsin Loess sections were described before the Iowa Academy of Science in 1953 (1), and data for in-place density and particle size were presented. The thickest of these sections was exposed in a newly opened quarry near Crescent City, Iowa (Fig. 1). This section was of particular interest because it showed several zones of clay concentration at different depths, and at that time it was suggested that the clayey zones might be related to lulls in deposition of the Wisconsin loess. The clayey zones divide the loess into four units which could supposedly correlate with the four advances of Wisconsin glaciation (Appendix A).
Proceedings of the Iowa Academy of Science
©1956 Iowa Academy of Science, Inc.
Handy, R. L. and Davidson, D.T.
"Evidence of Multiple Loess Deposition in Western Iowa,"
Proceedings of the Iowa Academy of Science, 63(1), 470-476.
Available at: https://scholarworks.uni.edu/pias/vol63/iss1/50