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Dayton—A Depositional Planosol, Willamette Valley, Oregon¹

ABSTRACT

Dayton soil has long been considered a Planosol (Albaqualf) with genetically related horizons developed from Willamette silts. However, a detailed study indicates that Dayton sola overlie six different materials including gravel, silt, and bedrock. The deposits which comprise the A2 and B2 horizons are not coextensive. Therefore, the boundaries between A2, B2, and C horizons represent depositional discontinuities. Soil formation across the discontinuities, under conditions of poor drainage, has produced so'a having morphologic and chemical properties of Planoso's

¹ Joint contribution Soil Conservation Service, USDA, and the Oregon Agr. Exp. Sta., Corvallis. Tech. Paper no. 2130.

² Research Soil Scientist and Areal Geologist, respectively, Soil Conservation Service, USDA, Corvallis, Ore.

Received for publication September 7, 1966. Accepted for publication November 9, 1966.