Keywords: Adel volcanics.jpg en Simplified geologic map of the Adel Mountain volcanic field From Stephen S Harlan Lawrence W Snee Mitchell W Reynolds Harald H Mehnert R G Schmidt Steve D Sheriff and Anthony J Irving 40Ar/39Ar and K-Ar Geochronology and Tectonic Significance of the Upper Cretaceous Adel Mountain Volcanics and Spatially Associated Tertiary Igneous Rocks Northwestern Montana Professional Paper 1696 U S Department of the Interior U S Geological Survey Reston Virginia 2005 http //pubs usgs gov/pp/2005/1696/pdf/PP1696 pdf U S Geological Survey 2005 Geological maps of Montana Cretaceous geology PD-USGov Maps of volcanoes in the United States Adel Mountains Volcanic Field |