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Data Sources
Topo
Ecoregions
Public Lands
...
BASEMAPS
Default Weather
Temperature
Smoke
...
WEATHER
Lower Miocene and Upper Oligocene rocks or rocks equivalent to Upper and Lower Miocene rocks and White River Formation (WYTmo;0)
Geologic Formation
in
WY
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Lithology
Claystone
Sandstone
Siltstone
Other
(2,963 mi²)
Geologic Age
Chattian – Late Miocene (28.1 Ma – 5.33 Ma ago)
Geologic Unit Label
Tmo
Lower Miocene and Upper Oligocene rocks–Light-colored soft porous sandstone and underlying white tuffaceous claystone and siltstone. Arikaree Formation in Denver Basin; rocks equivalent to Upper and Lower Miocene rocks and White River Formation–Light-colored sandstone, white tuffaceous blocky claystone, and siltstone. Black Hills.
—
USGS
Taxonomy
Classified As
Geologic Formation
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