Example image of eyePlorer eyePlorer map for 'Adel Mountains Volcanic Field': Great Falls, Montana Igneous rock Montana Volcanic field Geologist Ontario Theralite Timor Cretaceous Great Falls Tectonic Zone Sedimentary rock Two Medicine Formation Unconformity Breccia Conglomerate (geology) Extrusive Dike (geology) Intrusion Sill (geology) Volcanic plug Interstate Highway System Laccolith Cascade, Montana Fort Shaw, Montana Laramide orogeny Horse (geology) Thrust fault Highwood Mountains Judith Mountains Magma Continental drift Polar wander Hydrocarbon Petroleum American Bison Buffalo jump Native Americans in the United States Ulm, Montana Lewis and Clark Expedition Mullan Road Pacific Ocean Rocky Mountains Stagecoach Fort Benton, Montana Toll road Great Northern Railway (U.S.) Helena, Montana Montana Department of Transportation U.S. Route 91 Interstate 15