U.S. Geological Survey

Mineral Resources Program

Western Phosphate Field, U.S.A.: Science in Support of Land Management

Map of the Western Phosphate Field
The Western Phosphate Field is a 350,000-square-kilometer area of the northern Rocky Mountains.
Darkened areas represent exposures of the Phosphoria Formation.

U.S. Geological Survey Fact Sheet 100-02

Version 1.0
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FS-100-02 PDF file (1.29 MB) 
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