Soil-Geomorphology and Soil-Stratigraphy in the Lower Pomme De Terre River Valley, Southwestern Missouri
Miller, Michael Vernon
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https://hdl.handle.net/2142/70643
Description
Title
Soil-Geomorphology and Soil-Stratigraphy in the Lower Pomme De Terre River Valley, Southwestern Missouri
Author(s)
Miller, Michael Vernon
Issue Date
1984
Department of Study
Geography
Discipline
Geography
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Physical Geography
Abstract
During the years 1962 to 1977, studies of surficial geology and soil geomorphology in the Breshears Bottoms along the lower Pomme de Terre River, Southwestern Missouri, produced models of erosion, deposition and soil-stratigraphy. These studies chronicle events that began prior to 50,000 radiocarbon years before the present. A composite model of terrace formation and soil-stratigraphic relationships is constructed showing 4 distinct terraces or terrace complexes, T0, T1, T2, and T3. Soils found on these terraces show a chrono-sequence with entisols dominating T0, inceptisols and alfisols with weak argillic horizons dominating T1, mollisols and alfisols with strong argillic horizons dominating T2, and a surface paleosol and alfisols dominating T3. Buried paleosols were identified in the sediments of T1 and T2.
A site 3 km downstream from Breshears Bottoms containing 4 terrace levels was chosen to test the soil-geomorphic, soil-stratigraphic composite model constructed for the lower Pomme de Terre River valley. Results from this work generally support the composite model. However, less complexity was observed in the sediments of terrace T1 and no buried paleosol was observed. The sediments on terraces T2 and T3 were found to exhibit more complexity than had been observed previously and buried paleosol evidence was found in the sediments of both T2 and T3.
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