Labels:text | diagram | map OCR: EXPLANATION 118' 116' 114 !112' Bożemon 110' Montana 100 200 - 1 45 kilometers 45 Rhyolite Calderas or Volcanic Fields /? with approximate 0.6 age in millions of Ma years (Ma) Yellowstone /7 4.3 Mo. Plateau ET Volcanic Heise 2.11 NO Field Volcanic Boise Field :s 6.5 Mo = = *Idaho Jackson Falls Yellowstone crescent -- 43' Twin Falls ----- Volcanic . Field Blackfoot of high terrone ‘IV 43* 10.0-8.6 Ma Pocolello, SEISMIC ZONES OF THE Iwin INTERMOUNTAIN Falls Picabo Volcanic Oregon Field (Arbon Wyoming SEISMIC BELT Idaho Valley Tuff) " Lesser Holocene and 10.2 Ma: reactivated older faults - Nevada Bruneau-Jarbidge Utah / whose activity will McDermitt Volcanic Field 12.5-10.0 Ma increase in the future Volcanic Field Owyhee-Humboldt 11 Major Holocene: foulls 16.1-15.0 Mc Volcanic Field Evanston active today 41' 213.9-12.8 Mo 41-m Mojor late Pleistocene faults whose activity Salt Lake City Is decreasing 118' 116 114 112 -110* IV Major Tertiary faults. - 1 now inactive
