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Published in Soil Sci Soc Am J 32:556-563 (1968)
© 1968 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Pedogenic and Geomorphic Relationships of Associated Aqualfs, Albolls, and Xerolls in Western Oregon1

R. B. Parsons, G. H. Simonson and C. A. Balster2

ABSTRACT

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.

NOTES

1 Joint contribution Soil Conservation Service, USDA and the Oregon Agr. Exp. Sta., Corvallis. Technical Paper no. 2329, Oregon Agr. Exp. Sta.

2 Research Soil Scientist, Soil Conservation Service; Associate Professor, Oregon State Univ.; and Areal Geologist, Soil Conservation Service, Corvallis. The junior author is currently Research Petroleum Geologist, Billings, Mont.

Received for publication October 4, 1967. Accepted for publication March 15, 1968.






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Copyright © 1968 by the Soil Science Society of America.