THRUST BELT

Tf    FOWKES FORMATION (PLIOCENE? AND EOCENE)
Tcs   CONGLOMERATE OF SUBLETTE RANGE
Tgrw  GREEN RIVER AND WASATCH FORMATIONS
      WASATCH FORMATION
Twd     Diamictite and sandstone
Tw      Main body
TKe   EVANSTON FORMATION

                               NORTHWEST

Twr   WHITE RIVER FORMATION
Ti    INTRUSIVE IGNEOUS ROCKS
           THOROFARE CREEK GROUP
Twi          Wiggins Formation
Ttl          Two Ocean and Langford Formations--In places may include Trout 
               Peak Trachyandesite of Sunlight Group
Tt           Tepee Trail Formation
Ta           Aycross Formation
Tts        THOROFARE CREEK AND SUNLIGHT GROUPS--Includes Two Ocean and Langford
               Formations, Trout Peak Trachyandesite, and Wapiti Formation
Ts         SUNLIGHT GROUP--Includes Trout Peak Trachyandesite, Wapiti Formation,
               Crescent Hill Basalt, and Mount Wallace Formation
Ttp          Trout Peak Trachyandesite
Twp          Wapiti Formation
Thp        HOMINY PEAK FORMATION
Taw        WASHBURN GROUP--Includes Sepulcher, Lamar River, and Cathedral Cliffs
               Formations
Teml  MIDDLE AND LOWER EOCENE ROCKS--Equivalent to Aycross and Wild River
           Formations
Tv    VOLCANIC CONGLOMERATE--Jackson Hole
Twdr  WIND RIVER FORMATION--At base locally includes equivalent of Indian Meadows
           Formation
Tta   TATMAN FORMATION
Twl   WILLWOOD FORMATION