Precambrian basement geologic map of Montana--An interpretation of aeromagnetic anomalies

Online link http://pubs.usgs.gov/sim/2004/2829/
Description Geologic map showing the structure and history of the basement rocks of Montana. Most of the state is covered by Phanerozoic bedrock units; the underlying basement structure must be inferred from magnetic anomaly data combined with geologic observations.
Originators Sims, Paul K.; O'Neill, J. Michael; Bankey, Viki; and Anderson, Eric D.
Publication U.S. Geological Survey Scientific Investigations Map 2004-2829

States or counties

Greatly reduced image of the entire map sheet
Greatly reduced image of the entire map sheet