Tectonic Unit: CPOP
         Name: undivided
 
  Description: intertonguing shelf carbonate, shale, chert and
               sandstone
 
    Formation: Foreland Belt
                  Porcupine Terrane
                       CP   unnamed shale in E. Alaska and westernmost Yukon
                            Territory
 
    Age Range: Carboniferous - Permian
  Maximum Age: 362.5 Ma
  Minimum Age: 245.0 Ma