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Upper Miocene Rocks (WYTmu;0)

Geologic Formation in WY, NE

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Lithology

Claystone

Conglomerate

Sandstone

Other (5,227 mi²)

Geologic Age

Late Miocene (11.63 Ma – 5.33 Ma ago)

Geologic Unit Label

Tmu

Southwest Wyoming: South end of Wind River Range–Siliceous, arkosic, and locally radioactive sandstone, claystone, and conglomerate. Fission-track age about 27 Ma. Recent work suggests that part of these deposits may be of Eocene age. Pliocene and Miocene (as originally defined 2) South Pass Formation. Saratoga Valley–White to greenish-gray tuffaceous sandstone, siltstone, and claystone; locally conglomeratic. North Park Formation; Central Wyoming: Arkosic sandstone, conglomerate, and siltstone; some light-colored tuffaceous radioactive claystone and white cherty limestone. North of Sweetwater River in Granite Mountains–Light-colored tuffaceous radioactive claystone, siltstone, sandstone, and arkose. Moonstone Formation; East Wyoming: Light-colored tuffaceous claystone, sandstone, and conglomerate. Ogallala Formation in Denver Basin.

— USGS

Taxonomy

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Geologic Formation