Tectonic Unit: mKS
         Name: South Fork
 
  Description: calc-alkaline basaltic andesite, andesite, latite,
               rhyodacite and rhyolite flows, pyroclastics,
               ignimbrite, epiclastic rocks in calderas and fault
               troughs; nonmarine
 
    Formation: Intermontane Belt
                     lK   Mt. Nansen
                     luK  Kasalka
                     luK  Kingsvale
                     lK   Spences Bridge: Spius, Pimainus
               Omineca Belt
                  Distal North America
                     mK   South Fork
 
    Age Range: Mid-Cretaceous
  Maximum Age: 131.8 Ma
  Minimum Age:  88.5 Ma