Tectonic Unit: DMECA
         Name: Earn
 
  Description: westerly derived, chert-pebble conglomerate,
               chert-quartz sandstone, pebbly mudstone,
               blue-black siliceous shale, locally containing
               barite, brown shale, alkaline trachyte and
               rhyolite flows, breccia, tuff, pillow basalt and
               breccia; chert and limestone; marine and nonmarine
 
    Formation: Omineca Belt
                  Cariboo Subterrane of Cassiar Terrane
                       DM   Earn
                       M    Greenberry
                       DM   Guyet, upper Black Stuart, Waverly volcanics
 
    Age Range: Devonian - Mississippian
  Maximum Age: 408.5 Ma
  Minimum Age: 322.8 Ma