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Argixerolls on Late Pleistocene Surfaces in Northwestern Oregon
Author(s) -
Gelderman F. W.,
Parsons R. B.
Publication year - 1972
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/sssaj1972.03615995003600020037x
Subject(s) - geology , pleistocene , geomorphology , alluvium , stratigraphy , river terraces , archaeology , paleontology , geography , structural basin , fluvial , tectonics
Argixerolls in the Yamhill Valley in Polk County, Oregon, have characteristics that are determined by the age, topography, and parent materials of three late Pleistocene geomorphic surfaces. The newly defined Bethel surface is in the highest topographic position. Four Willamette‐like pedons were sampled as representative of three topographic positions on the Senecal and Bethel surfaces. The Senecal surface is characterized by level and nearly level valley terraces and the Bethel surface by low, rounded hills that are graded to the level, intermediate Calapooyia surface. The soils of the upper slopes of the Bethel surface have characteristics of Ultic Argixerolls. Those on the nearly level Senecal and Calapooyia surfaces and the lower slopes of the Bethel surface have characteristics of Pachic Ultic Argixerolls. The soils on the level to depressional hill crests of the Bethel surface and level valley terraces of the Senecal surface have characteristics of Aquultic Argixerolls. Characterization of the soils emphasized similarities among them. Subgroup differences are due primarily to topographic position and are related to the stratigraphy of the region.