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General Soil Map of the United States¹

ABSTRACT

This map shows the distribution of the principal kinds of soil in the USA as classified in the system currently used by the soil survey. The map can be used only for comparing soils of large areas. It has 331 units defined mostly as associations of phases of great groups. A brief legend on the front of the map explains the colors that distinguish soil orders, lists the symbols for dominant great groups and special features, and includes an introduction to the nomenclature. A detailed legend on the back of the map is arranged alphabetically by great groups within a suborder of each order. The legend provides general definitions for the orders, suborders, and great groups, present dominant land use for the suborders, and approximate equivalent former names for the great groups. The map, scale 1:7,500,000, size 48 by 71 cm, was compiled on the National Atlas base with an Albers equal area projection. The soil information is current as of December 1967. The base map shows state boundaries, major drainages, principal cities, and state experiment stations. The soil map, in color, is for sale by the U. S. Geological Survey, 1200 S. Eads Street, Arlington, Va. 22202.

¹ Contribution from the Soil Conservation Service, USDA, Washington, D.C.

² Soil Scientists, Soil Conservation Service, USDA

Received for publication March 28, 1969. Accepted for publication April 21, 1969.