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Open-File Report 2006–1138

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Preliminary Geologic Map of the Townsend 30' x 60' Quadrangle, Montana

By Mitchell W. Reynolds and Theodore R. Brandt

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The geologic map of the Townsend quadrangle, scale 1:100,000, was made as part of the Montana Investigations Project to provide new information on the stratigraphy, structure, and geologic history of this geologically complex area in west-central Montana. The quadrangle encompasses about 4,200 square km (1,640 square mi).


The geologic map of the Townsend quadrangle, Montana, provides a summary of new and selected existing geologic information for public use and use by Federal, State, and local governmental agencies for land-use planning, including assessment of natural resources and natural hazards and recreational potential, and for land-use management. The geologic map is an element in the cooperative program between the State of Montana and the U.S. Geological Survey to produce 1:100,000-scale geologic map coverage for the entire State.

Version 1.0

Posted May 2006

Associated database files, ArcInfo export files and ArcView shapefiles.

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