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Fragipans in Pennsylvania Soils: Properties of Bleached Prism Face Materials¹

ABSTRACT

Bleached prism faces are a common feature of soil fragipan horizons. Particle size and chemical and clay mineralogy data indicate these zones are areas of accumulation of material from horizons above. The data also indicates that two processes are active in the movement of material into the prism face area. These processes result in bimodal distribution of particle sizes in the prism face areas. The exact nature of the processes is unclear and may involve both deposition and some stripping.

¹ Authorized for publication on 12 Dec. 1974 as Paper 4783 of the Journal Series of the Pennsylvania Agric. Exp. Sta. University Park, PA 16802.

² Assistant Professor, Associate Professors, and Professor of Soil Genesis and Morphology, respectively, Department of Agronomy, The Pennsylvania State Univ. The senior author is now deceased.

Received for publication December 13, 1974. Accepted for publication February 14, 1975.