Date of this Version
Thesis (M.S.)--University of Nebraska--Lincoln, 1967. Department of Agronomy.
The purpose of this study is to describe the landscape relationships of Malcolm and Morrill soils in southwestern Saunders County, Nebraska, and to provide chemical and physical data for profiles representative of these soils.
Malcolm has a very dark grayish brown, granular A horizon and a very dark grayish-brown or pale brown B horizon of silty clay loam texture and weak blocky structure. Malcolm occurs on a narrow, peaked portion of the interfluve at elevations lower than Morrill. Geomorphic dissection of sands and silts of the Fullerton formation at this location formed a relatively narrow configuration of the interfluve surface. The sediments in which Morrill soil has formed are separated from the Fullerton formation by a stone line concentrated from till, and represent the Loveland formation. The reddish-brown color of these sediments has been attributed to weathering during the Sangamon time, but some of this weathering may have occurred prior to their deposition. Particle size analyses of a Malcolm profile within the study area and fine stratification within its C horizon suggest that the parent material of this soil consists of sediments deposited by water and wind. Since these sediments occur below the Loveland formation, and Cedar Bluffs, and Nickerson till, they represent the Fullerton formation (Late Nebraskan).
The Morrill profile represents at least two cycles of soil development. As well, the Malcolm profile exhibits less weathering and soil development than the Morrill profile.
Advisor: James V. Drew.