Slick Spots in Southeastern Nebraska—Patterns and Genesis1
- David T. Lewis and
- James V. Drew2
Slick spots formed in Peoria loess near the crests of interfluves in southeastern Nebraska were studied in relation to their distribution and genesis. Peoria loess forms a discontinuous mantel over a maturely dissected plain of Kansan till. Soils within the slick spots are low in chroma, contain some soluble salts, and have more extractable sodium than associated soils formed in Peoria loess. Calculations indicate that clay formed per unit of nonclay lost was greater in a slick spot soil profile than in an adjacent soil profile. Subsurface data indicate that the configuration of an erosion surface cut into Kansan till underlying the slick spot and the differential permeability of Illinoian sediments above the till contribute to the occurrence of a perched ephemeral water table in the loess beneath the slick spot. The evidence suggests that soluble products of weathering, including Na and Ca, are added to the slick spot by capillary rise from a perched water table following periods of above average precipitation and accumulate in the slick spot during subsequent periods of intense evapotranspiration.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © .