Mazama Ash  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Cenozoic
 ...Quaternary
 ....Mazama Ash
RTAlberta
 Saskatchewan
 Montana
 Washington
 Oregon
 Mount Mazama
SNRefers to any or all of several Quaternary volcanic ash beds, commonly used as geochronologic markers in Oregon, Washington, Montana, Alberta and Saskatchewan. Erupted from prehistoric Mount Mazama.