Unified Soil Classification System

Unified Soil Classification System

The Unified Soil Classification System (or USCS) is a soil classification system used in engineering and geology disciplines to describe the texture and grain size of a soil. The classification system can be applied to most unconsolidated materials, and is represented by a two-letter symbol. Each letter is described below (with the exception of Pt):

Symbol chart

See also

* AASHTO Soil Classification System
* AASHTO
* ASTM International

References

American Society for Testing and Materials, 1985, D 2487-83, "Classification of Soils for Engineering Purposes: Annual Book of ASTM Standards". Vol. 04.08, pp 395-408.


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