Abrupt texture change (Figure 1).

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Abrupt texture change (Figure 1).
Abrupt texture change (Figure 1).

Abrupt textural change.—A diagnostic soil characteristic of mineral soils defined as a considerable increase in silicate clay content within a short vertical distance (<7.5 cm) between the epipedon and an underlying argillic, kandic, glossic, or natric subsoil horizon. The required clay increase varies depending on the clay content of the epipedon. Where present, this feature significantly restricts the downward movement of water. From the standpoint of soil genesis, it generally suggests that the soil formed on a relatively stable geomorphic surface of significant age.

Figure 1.—The Chilcott series (fine, smectitic, mesic Abruptic Xeric Argidurids) have an abrupt texture change at a depth of about 8 inches with an estimated clay increase of 30 percent within a vertical distance of 1 to 3 inches (upper boundary of 2Bt horizon). The Chilcott series consists of moderately deep to duripan, well drained soils with slow permeability that formed in a thin mantle of loess and silty alluvium from loess and weathered volcanic ash over loamy or sandy and gravelly alluvium from igneous materials.

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Taken on: November 29, 2024
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