Tectonic Unit: uKC
         Name: Carmacks
 
  Description: potassic, alkaline, mainly porphyritic andesite
               flows and pyroclastics with lesser rhyolite,
               trachyte, and dacite; mainly basalt in upper part;
               nonmarine
 
    Formation: Intermontane Belt
                  uK   Carmacks, Brian Boru, Tip Top Hill, Open Cr.,
                       Hutshi
               Omineca Belt
                  uK   Carmacks
    
    Age Range: Upper Upper Cretaceous
  Maximum Age: 88.5 Ma
  Minimum Age: 65.0 Ma