.0
g     Ice fields or glaciers
.681
-     Water (streams, lakes, ocean)
.5
bu    Bedrock of unknown type or age


      QUATERNARY AND LATE TERTIARY DEPOSITS
---------------------------------------------------------------------
.21
Qs    Surficial deposits, undifferentiated
.12
Qv    Volcanic rocks, undivided

      Quaternary and (or) Tertiary
.410
QTv   Volcanic rocks, undivided
.78
QTi   Intrusive rocks, undivided

              TERTIARY ROCKS
---------------------------------------------------------------------
             SEDIMENTARY ROCKS
.88
Tsu   Sedimentary rocks, undivided
.85
Tk    Kenai Group, undivided
.85
      Tsf  Sterling Formation
.85
      Tkb  Beluga Formation
.85
      Tty  Tyonek Formation
.37
Tn    Nenana Gravel
.30
Tcb   Coal-bearing rocks
.35
Ttw   Tsadaka, West Foreland, and Wishbone Formations, 
        undivided
.35
      Tts  Tsadaka Formation
.35
      Twf  West Foreland Formation
.35
      Tw   Wishbone Formation
.85
Tvs   Volcanic and sedimentary rocks, undivided
.85
Tfv   Fluviatile sedimentary rocks and subordinate
        volcanic rocks
.91
Tch   Chickaloon Formation
.136
Tar   Arkose Ridge Formation
.40
Tovs  Sedimentary and volcanic rocks of the Orca Group, 
        undivided
.40
      Tos  Sedimentary rocks of the Orca Group
.40
      Toc  Conglomerate of the Orca Group
.416
      Tov  Volcanic rocks of the Orca Group, undivided



                IGNEOUS ROCKS
         Volcanic and hypabyssal rocks
.365
Tvu   Tertiary volcanic rocks, undivided
.365
Trs   Rhyolitic volcanic and sedimentary rocks
.365
Tb    Basalt
.237
Thf   Hypabyssal felsic and intermediate intrusions
.345
Thm   Hypabyssal mafic intrusions
.76
Thd   Hornblende dacite, Pliocene
.420
Tba   Basaltic andesite
.413
Tvr   Crystal and crystal-lithic ash-flow tuff
.413
Tvb   Andesite and basalt
.416
Tcv   Volcanic rocks of the Cantwell Formation



            Intrusive rocks
.279
Tiv   Granitic and volcanic rocks, undivided

              OLIGOCENE
          -----------------------------
.270
Togr  Granite

          OLIGOCENE OR EOCENE
          -----------------------------
.180
Toegr Granitic rocks
.423
Toem  Granodiorite to tonalite


                 EOCENE
          -----------------------------
.177
Tegr  Granite and granodiorite
.177
Td    Felsic intrusions


                PALEOCENE
          -----------------------------
.361
Tpgr  Granitic rocks
.273
Thgd  Granodiorite and other intermediate plutonic
            granitic rocks
.372
Tgl   Gabbro


            METAMORPHIC ROCKS
.665
Tms   Schist, migmatite, and granite



          TERTIARY AND/OR CRETACEOUS
---------------------------------------------------------------------
              SEDIMENTARY ROCKS

.749
TKcg  Conglomerate, sandstone, and lignite


                 IGNEOUS ROCKS
        Volcanic and hypabyssal rocks
.126
TKv   Flows, tuff, and breccia, undivided
.126
TKd   Dikes and subvolcanic rocks of intermediate 
        composition
.126
TKgp  Hypabyssal granite porphyry dikes and rhyolitic 
        sills, and plugs
.126
TKvr  Rhyolite and related rocks
.126
TKvi  Andesite and related rocks
.129
TKiv  Mafic to intermediate volcano-plutonic complexes