TERRACE GRAVEL (PLEISTOCENE AND/OR PLIOCENE)--Partly consolidated gravel above
     and flanking some major streams.  QTg
CONGLOMERATE
  Northwest Wyoming (Jackson Hole) (Pleistocene or Pliocene)--Paleozoic clasts, chiefly of
     Madison Limestone, in a lithified carbonate matrix. QTc
  Central (Medicine Bow Mountains) and east Wyoming (east of Laramie Mountains) (Pleistocene
     to Miocene)--Giant granite boulders in an arkose matrix. QTc
BUG FORMATION (PLEISTOCENE OR PLIOCENE)--Lacustrine white marl, claystone,
     sandstone, conglomerate, and tuff; generally radioactive. QTb