Tectonic Unit: DME
         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
                  Ancestral North America
                       DM   Earn, Crystal Pk., Prevost
                       uD   Itsi
                       D    Portrait L.,
                       iD   Sapper
               Foreland Belt
                  Ancestral North America
                       DM   Earn
 
    Age Range: Devonian - Mississippian
  Maximum Age: 408.5 Ma
  Minimum Age: 322.8 Ma