LANDSLIDE CREEK FORMATION--Greenish-gray bentonitic tuffaceous sandstone and con-
     glomerate.  Klc
HAREBELL FORMATION--Gold-bearing quartzite conglomerate, olive-drab sandstone, and
     green claystone.  Kha
LANCE FORMATION
  North Wyoming--Thick-bedded buff sandstone and drab to green shale; thin conglomerate
     lenses.  Kl, Klm
  South and northeast Wyoming--Brown and gray sandstone and shale; thin coal and car-
     bonaceous shale beds.  Kl
MEDICINE BOW FORMATION--Brown and gray sandstone and shale; thin coal and car-
     bonaceous shale beds.  Kmb
FOX HILLS SANDSTONE--Light-colored sandstone and gray sandy shale containing marine
     fossils.  Kfh, Kfl, Kfb, Klm
MEETEETSE FORMATION (AGE ABOUT 73 Ma)--Chalky-white to gray sandstone, yellow, 
     green, and dark-gray bentonitic claystone, white tuff, and thin coal beds.  Km, Klm, Kml
LEWIS SHALE (AGE ABOUT 68 Ma)--Gray marine shale containing many gray and brown 
     lenticular concretion-rich sandstone beds.  Kle, Klm, Kfl, Kml
BEARPAW SHALE--Dark-greenish-gray shale containing thin gray sandstone partings.  Kfb, Klm