PASS PEAK FORMATION AND EQUIVALENTS--Includes Lookout Mountain Conglomerate
     Member of Wasatch Formation. On the south side of Gros Ventre Range consists of
     gold-bearing quartzite conglomerate; intertongues southward with sandstone and
     claystone of main body of Wasatch Formation.  Tp
MIDDLE AND LOWER EOCENE ROCKS--Equivalent to Aycross and Wind River Formations. Teml
CRANDALL CONGLOMERATE--Nonvolcanic conglomerate containing clasts of Lower
     Paleozoic rocks.  Tcr
WIND RIVER FORMATION
  Northwest Wyoming (Jackson Hole)--Variegated red and white claystone and siltstone; largely
     nontuffaceous except near the top; lenticular coal unit in middle.  At base locally
     includes equivalent of Indian Meadows Formation.  Twdr
  Central Wyoming--Variegated claystone and sandstone; lenticular conglomerate.  Age of tuff
     at top 49 Ma.  Twdr, Twim
INDIAN MEADOWS FORMATION--Red to variegated claystone, sandstone, and algal-ball(?)
     limestone; some beds of large Paleozoic boulders and detachment masses of
     Paleozoic and Mesozoic rocks.  Tim, Twim
TATMAN FORMATION--Drab nontuffaceous claystone, oil shale, lignite, and sandstone.  Tta 
WILLWOOD FORMATION--Variegated claystone, shale, and sandstone; some lenticular gold-
     bearing quartzite conglomerate.  Twl
INTRUSIVE AND EXTRUSIVE IGNEOUS ROCKS (CHIEFLY EOCENE; AGE OF INTRUSIVES ABOUT 53 TO 55 Ma)
    --Incorporates masses of Mississippian through Cambrian formations.  Confined to 
    Black Hills.  Tie