ADAVILLE FORMATION--Gray sandstone, siltstone, and carbonaceous claystone;
     conglomeratic in upper part; coal-bearing in lower part.  Kav
HILLIARD SHALE--Dark-gray to tan claystone, siltstone, and sandy shale.  Kh
BLIND BULL FORMATION--Gray to tan conglomeratic sandstone, siltstone, claystone, coal,
     and bentonite.  Kbb
EVERTS FORMATION, EAGLE SANDSTONE, AND TELEGRAPH CREEK FORMATION--Massive 
     to thin-bedded sandstone, mudstone, and shale.  Ket
SOHARE FORMATION--Lenticular gray and brown sandstone and shale; thin coal beds.  Kso, Ksb
BACON RIDGE SANDSTONE--Gray to tan marine sandstone and thick coal beds; gold-
     bearing quartzite conglomerate in lower part.  Kb, Ksb
MESAVERDE FORMATION--Light-colored massive to thin-bedded sandstone, gray sandy
     shale, and coal beds. In Jackson Hole locally contains gold-bearing quartzite
     conglomerate. North of North Fork Powder River east of the Bighorn Mountains, 
     consists solely of the Parkman Sandstone Member. Kmv
MESAVERDE GROUP (SOUTH WYOMING)
  Rock Springs uplift
    Almond Formation--White and brown soft sandstone, gray sandy shale, coal, and car-
     bonaceous shale.  Kal
    Ericson Sandstone--White massive sandstone; lenticular chert-grit conglomerate in
     upper part.  Ke
    Rock Springs Formation--White to brown sandstone, shale, and claystone; numerous coal
     beds.  Kr
    Blair Formation--Drab-yellow and brown sandstone and sandy shale.  Kbl
  Rawlins uplift
    Almond Formation--White and brown soft sandstone, gray sandy shale, coal and car-
     bonaceous shale.  Kmv
    Pine Ridge Sandstone--Light-gray sandstone and thin coal beds.  Kmv
    Allen Ridge Formation--Gray sandstone, shale, and thin coal beds.  Kmv 
    Haystack Mountains Formation--Gray marine sandstone and shale.  Kmv
  Laramie Basin
    Pine Ridge Sandstone--Light-gray sandstone and thin coal beds.  Kmv
    Rock River Formation--Soft sandstone and sandy shale.  Kmv
BAXTER SHALE--Gray to black soft sandy shale and shaly sandstone.  Kba
CODY SHALE (AGE 78 TO 83 Ma)
  Northern Yellowstone area--Gray to brown shale and siltstone.  Kc
  North and south Wyoming--Dull-gray shale, gray siltstone, and fine-grained gray 
     sandstone.  Kc, Kcf