Labels:text | diagram | map | drawing OCR: EXPLANATION 118 116' 114* !112" Bozeman 110 Montana 0- 100 200 1 45 kilometers 45' Rhyolite Calderas or Volcanic Fields with approximate 0.6 age in millions of years (Ma) .2 Yellowstone 4.3 Ma Plateau IVolcanic Heise 12.1 Field Volcanic Boise Field 6.5 Mo - Jackson Aldaho Falls Yellowstone crescent 43 Twin Falls Volcanic Field Blackfoot of high terrone IV 43 10.0-8.6 Ma Pocatello! SEISMIC ZONES OF THE INTERMOUNTAIN Twiny Falls Picabo Volcanic , Wyoming SEISMIC BELT - ----- Oregon Field (Arbon Idaho Valley Tuff) Lesser Holocene and Nevada 10.2 Ma Bruneau-Jarbidge reactivated older faults - Volcanic Field Utah whose activity will -- McDermitt Volcanic 12.5-10.0 Ma increase in the future Field Owyhee-Humboldt 11 Major Holocene faults 16.1-15.0 Ma Volcanic Field /Evanston active today 213.9-12.8 Ma 41: Major late Pleistocene faults whose activity Salt Lake City Is decreasing 118' 116 114' 112 110 Major Tertiary faults now inactive -
