STUDY OF SOME PHYSICAL AND CHEMICAL PROPERTIES OF AN OKLAHOMA SOIL PROFILE WITH CLAY-IRON BANDS

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Abstract
Field and laboratory studies were made on a coarse-textured sandy soil of Oklahoma (Derbylike) to determine some of the characteristics of the clay-iron bands (lamellae) which occur in this profile. The collected data were subsequently analyzed to: 1) hypothesize the genesis of these bands, and 2) test the classification of this soil as an Alfisol.Analysis indicates that the data obtained from the clay-iron bands differ significantly from the measurements collected on the interband layers. Important variances include higher values for the lamella samples in: clay content, very fine sand, organic matter, CEC, free iron, and total iron. High base saturation percentages characterize all levels of the soil profile. The data collected indicate that the lamella formation in this sandy soil is primarily due to the rhythmic precipitation of clay and iron. It is most probably the product of an eolian depositional environment. Due to the lack of evidence of significant eluviation or illuviation processes the data suggest that the Derby series should be reactivated and should be classified with Alfic Ustipsamments rather than as an Alfisol. These soils occur on younger landforms associated with Tivoli and other true Entisols. Field and laboratory studies were made on a coarse-textured sandy soil of Oklahoma (Derbylike) to determine some of the characteristics of the clay-iron bands (lamellae) which occur in this profile. The collected data were subsequently analyzed to: 1) hypothesize the genesis of these bands, and 2) test the classification of this soil as an Alfisol. Analysis indicates that the data obtained from the clay-iron bands differ significantly from the measurements collected on the interband layers. Important variances include higher values for the lamella samples in: clay content, very fine sand, organic matter, CEC, free iron, and total iron. High base saturation percentages characterize all levels of the soil profile. The data collected indicate that the lamella formation in this sandy soil is primarily due to the rhythmic precipitation of clay and iron. It is most probably the product of an eolian depositional environment. Due to the lack of evidence of significant eluviation or illuviation processes the data suggest that the Derby series should be reactivated and should be classified with Alfic Ustipsamments rather than as an Alfisol. These soils occur on younger landforms associated with Tivoli and other true Entisols. © Williams & Wilkins 1976. All Rights Reserved.

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