(Thrust Belt) Main body--Variegated red to gray, brown, and gray mudstone and sandstone; conglomeratic lenses. (in southwest Wyoming) - Drab to variegated claystone and siltstone, carbonaceous shale and coal, buff sandstone, arkose, and conglomerate. In northwestern part of Green River Basin is thick arkosic light-yellowish-tan sandstone intertonguing with pale-green to gray claystone and shale. (in east Wyoming) - Drab sandstone and drab to variegated claystone; numerous coal beds in lower part.
Thick beds of yellow sandstone interbedded with gray and black shale and many coal beds.
Dark-gray clay shale and concretionary sandstone.
Soft gray sandstone, gray and brown carbonaceous shale, and thin coal beds.
Tongue River (Tftr) - Thick beds of yellow sandstone interbedded with gray and black shale and many coal beds. Lebo Member (Tfl) - Dark-gray clay shale and concretionary sandstone.
Clay, silt, sand, and gravel in flood plains, fans, terraces, and slopes.
Lebo Member (Tfl) - Dark-gray clay shale and concretionary sandstone. Tullock Member (Tft) - Soft gray sandstone, gray and brown carbonaceous shale, and thin coal beds.
(North Wyoming) - Thick-bedded buff sandstone and drab to green shale; thin conglomerate lenses. (South and Northeast Wyoming) - Brown and gray sandstone and shale; thin coal and carbonaceous shale beds.
Dark-gray concretionary marine shale; contains several bentonite beds.
Light-colored sandstone and gray sandy shale containing marine fossils.
Yellowish orange sandstone, sandy and silty carbonaceous shale, and coal. Alluvial plain. Thickness as much as 300 m (984 ft).
White to pale-pink blocky tuffaceous claystone and lenticular arkosic conglomerate.
Yellow sandstone interbedded with subordinate grayish brown and black shale and thin beds of coal. Alluvial plain. Thickness as much as 180 m (590 ft).
Gravel, sand, silt, and clay deposits of stream and river channels, and floodplains.
Light gray, bentonitic claystone that alternates with gray to brown sandstone interbedded with carbonaceous shale. Laterally equivalent to Lance Formation. Fluvial and flood plain. Thickness as much as 335 m (1,100 ft).
Dark gray carbonaceous shale, bentonitic claystone, sandstone, and coal. Alluvial plain. Thickness as much as 185 m (607 ft).