Tectonic Unit: TrJSA
         Name: Spray River
 
  Description: Jurassic shale, organic-rich paper shale,
               sandstone, phosphatic and cherty limestone;
               Triassic shoaling-upward marine siltsone,
               sandstone, limestone, dolostone, collapse breccia,
               rare gypsum; marine
 
    Formation: Foreland Belt
                  Artic Alaska Terrane
                       Spray R.
 
    Age Range: Triassic - Jurassic
  Maximum Age: 245.0 Ma
  Minimum Age: 145.6 Ma