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Pedogenic and Geomorphic Relationships of Associated Aqualfs, Albolls, and Xerolls in Western Oregon
Author(s) -
Parsons R. B.,
Simonson G. H.,
Balster C. A.
Publication year - 1968
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1968.03615995003200040038x
Subject(s) - overbank , alluvium , pedogenesis , geology , weathering , soil water , geochemistry , alluvial plain , geomorphology , facies , paleontology , soil science , structural basin
The distribution of Willamette, Woodburn, Amity, Concord, Holcomb, and Dayton soils is related to deposits and geomorphology of the main floor of the Willamette Valley. Claytextured alluvium was the parent material for the formation of Dayton, Concord, and Holcomb B horizons. Amity soils occur on low knolls where clay was not deposited. Willamette, Woodburn, and Holcomb soils have thick Al horizons partly as a product of overbank alluvial deposition along natural levees. Soil formation has resulted in organic accumulation, base eluviation, iron and manganese segregation into concretions, and argillic horizons. The soils contain one or more discontinuities and have not been derived from the weathering in place of “Willamette Silts” as previously reported. Chemical properties may reflect initial differences in the parent materials as well as subsequent soil development.