Tectonic Unit: CDRC
         Name: Rocky Mountains
 
  Description: resistant dolomite, limestone and local sandstone
               interbedded with recessive red, green and grey
               shale and detrital carbonate that together form
               several carbonate-shale grand cycles.  These pass
               westward into offshelf shale, siltstone and
               thin-bedded carbonate with minor alkalic tuff,
               breccia and amygdaloidal basalt of Cambrian (Cv),
               Cambro-Ordovician (COv), Silurian (Sv) and Devonian
               (Dv) ages but mainly of Ordovician (Ov) age.
               Chert and greywacke also occur in Cariboo
               subterrane; marine
 
    Formation: Omineca Belt
                  Cassiar Terrane
                       mD   McDame
                       lD   dol., ss
                       SD   Askin
                       S    Sandpile
                       OD   Road R.
                       CO   Kechika
 
    Age Range: Cambrian - Devonian
  Maximum Age: 570.0 Ma
  Minimum Age: 362.5 Ma