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Fragipan Horizons and Be Masses in the Middle Coastal Plain of North Central North Carolina¹

ABSTRACT

Soils with fragipan horizons are minor in areal extent but soils with friable eluviated (Be) masses are common along the 120- and 140-foot contours (37- to 43-m) of the Sunderland geomorphic surface between Goldsboro, N. C., and Emporia, Va. Where they occur, fragipan horizons commonly have Be masses, and in some the dense brittle materials and friable eluviated materials are intimately mixed. The morphology of fragipan horizons and horizons with Be masses are similar and it is difficult to separate them where they merge on the landscape. Brittleness is about the only feature that can be used consistently to separate fragipan horizons and horizons with Be masses. Brittleness that is produced by partial iron cementation, plinthite for example, should not be used in identification of fragipan horizons.

¹ Paper no. 2628 of the Journal Series. Joint contribution from the Soil Conservation Service, USDA, and the Departments of Soil Science and Experimental Statistics, North Carolina Agr. Exp. Sta., Raleigh, N.C.

² Project manager, Korean Soil Survey, CPO 143 Seoul, Korea (formerly State Soil Scientist, Soil Conservation Service, Raleigh, N.C.).

³ Soil Scientists, Soil Conservation Service, and Soil Science Department, North Carolina State University, Raleigh.

⁴ Associate Professor, Department of Experimental Statistics, North Carolina State University, Raleigh.

Received for publication August 25, 1968. Accepted for publication April 14, 1969.