Tectonic Unit: DMB
         Name: Besa River
 
  Description: shale, mudstone and siltstone; marine; most distal
               part of northerly derived Imperial Assemblage and
               westerly derived Earn Assemblage; upper Devonian
               shale partly derived from craton
 
    Formation: Foreland Belt
                  Ancestral North America
                       M    Banff
                       DM   Besa R., Exshaw
                       uD   Fort Simpson
                       mD   Horn River
 
    Age Range: Devonian - Mississippian
  Maximum Age: 408.5 Ma
  Minimum Age: 322.8 Ma