Tectonic Unit: JB
         Name: Bonanza
 
  Description: on Vancouver Island: olivine basalt, tholeiitic
               andesite, dacite and rhyolite; calc-alkaline
               dacite and rhyolite; mostly pyroclastic; on Queen
               Charlotte Islands: calc-alkaline andesitic
               pyroclastics, lesser flows, tuffaceous sandstone
               and shale; marine and nonmarine
 
    Formation: Insular Belt
                  Wrangell Terrane
                       uJ   Root Gl.
                       muJ  Kapoose
                       mJ   Nizina Mtn., Moresby, Yakoun
                       lmJ  Lubbe Cr., Maude
                       lJ   upper Kunga, Bonanza, Harbledown
               Coast Belt
                  Wrangell Terrane
                       lmJ  Bowen I.
                       lJ   Harbledown
 
    Age Range: Lower and Middle Jurassic
  Maximum Age: 208.0 Ma
  Minimum Age: 157.1 Ma