Geologic Mapping Program

Mapping MontanaOur main task is to produce maps that show bedrock and surficial units, faults and other structures, geologic data, and cross sections. The maps also provide descriptions of map units, how the units correlate, and most provide a discussion of the map area geology.

All our geologic maps are accessible and usable by the public as digital products through our DATA CENTER.

Funding for mapping comes from the State of Montana, and from the STATEMAP Program of the U.S. Geological Survey. The national program aims to establish the geologic framework of areas determined to be vital to the economic, social, or scientific welfare of individual states.

The MBMG's long-range STATEMAP goals are:
  1. To address the need for statewide, comprehensive, integrated, and publicly accessible geologic maps at a consistent scale by producing maps of all 30' x 60' quadrangles in Montana. In geologically complex areas, larger scale maps of 7.5’ quadrangles are prepared and published [link 7.5’ quad maps], then used to prepare the 30’ x 60’ quadrangles. Completed 30' x 60' quadrangle geologic maps go into a seamless statewide geodatabase provided as map and geodata services. It allows users to extract digital data for any area of Montana, and provides a map base for mapping applications.
  2. To publish large-scale maps of Montana’s intermontane valleys, transportation corridors, and areas with significant structural, and/or stratigraphic problems, or other significant geologic interests. The aim is to provide detailed geologic maps for high-priority areas of continuing or anticipated population growth, and land development, as well as for areas of economic, geologic hazard, or scientific interest. (see Special Focus Map and EDMAP projects)