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A Lithosequence in Coastal Plain Sediments in Alabama¹

ABSTRACT

A lithosequence was used to explain the morphology and genesis of soils from the Tuscahoma Sand Formation in Crenshaw County, Alabama. Position-slope-geology computer displays were used for sampling and determining the distribution and extent of soils in the analysis area. The Tuscahoma Sand Formation has a locally distinctive topography and suite of soils that are closely related to the characteristics of three outcrop beds on 8–12% side-slopes. The lower stratum, exposed farthest inland, is dominated by clayey soils. In argillic horizons the CEC ranges from 5.4 to 17.2 meq/100 g even though smectites dominate in one profile. Fine-loamy soils with siliceous mineralogy dominate the middle stratum. The youngest sediments, superpositioned above the middle stratum, are clayey with mixed mineralogy. The pH of argillic horizons ranged from 4.9 to 5.2. All clayey soils were Hapludults while the fine-loamy soils are now classified Paleudults; however, morphological properties suggest that all soils studied may be Hapludults. With all other soil-forming factors relatively constant, the differences encountered in soils across the study area relate directly to parent material.

¹ A contribution from the Dept. of Agronomy and Soils, Auburn University, Auburn, AL 36830.

² Graduate Assistant and Professor, respectively, Dept. of Agronomy and Soils, Auburn Univ., Auburn, Ala. Senior author is now Soil Specialist, Alabama Cooperative Extension, Auburn, AL 36830.

Received for publication November 7, 1977. Accepted for publication September 18, 1978.