Tectonic Unit: TQW
         Name: Wrangell
 
  Description: calc-alkaline andesite, dacite and lesser basalt
               and rhyolite in E. Alaska; subalkaline basalt,
               basaltic andesite, lesser dacite, trachyte and
               rhyolite in Yukon; as lavas, pyroclastics,
               commonly as dissected volcanoes, TQgl associated
               tillite; nonmarine
 
    Formation: Insular Belt
                  TQ   Wrangell (includes - 1500 yr old White R. ash),
                       Edgecumbe
                  TQgl tillite
 
    Age Range: Tertiary and Quaternary
  Maximum Age: 65.0 Ma
  Minimum Age:  0.0 Ma