SYMPOSIA PAPER Published: 01 January 1960

Identifying Soils by a Triangle Based on Unified Soil Classification System


This paper presents a general discussion of the Unified Soils Classification System (USCS) and outlines the development and use of a trilinear graph for identifying soils under this system. The material presented is based on the U. S. Army Corps of Engineers Technical Memorandum No. 3-357 published in 1953. However, the trilinear chart for graphical soils identification developed herein should be usable without modification by any public or private agency using the USCS.

Author Information

McMinn, Jack
Brewer and Associates, San Francisco, Calif.
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Developed by Committee: D18
Pages: 369–375
DOI: 10.1520/STP44333S
ISBN-EB: 978-0-8031-5952-5
ISBN-13: 978-0-8031-6106-1