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Chapter 3.1

Type Kind

Structureless :

No observable aggregation or clear orderly arrangement around natural lines of weakness.

Single grain structure : Loose mass of individual particles. Commonly found in sandy soils.

Massive structure : Soil appears in large clods with no visible structure.

Block-like:

Soil particles are arranged around a point and bounded by flat or rounded surfaces.

Blocky (angular blocky): Faces are rectangular and flattened. Faces intersect at relatively sharp angles.

Sub-angular blocky: Faces are a mixture of rounded and flattened. The edges are mostly rounded.

Granular structure: Sphere-shaped and characterized by rounded edges.

Plate-like:

Soil particles are arranged on a horizontal plane bounded by flat surfaces.

Platy structure:

Flat plates of soil that lie horizontally.