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Rock Formations

Measure

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Topo

Ecoregions

Public Lands

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BASEMAPS

Default Weather

Temperature

Smoke

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WEATHER

Oligocene sedimentary rocks (COTos;0)

Geologic Formation in CO, UT

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Lithology

Siltstone

Siltstone

Shale

Other (334 mi²)

Geologic Age

Eocene – Oligocene (56 Ma – 23.03 Ma ago)

Geologic Unit Label

Tos

Northwest: includes Duchesne River Fm (sandstone and shale; includes some rocks of Eocene age) and Bishop Conglomerate near Utah border. South-central: includes Florissant Lake Beds (tuffaceous shale and tuff) and Antero Fm (limestone tuff, tuffaceous sandstone, and conglomerate). Southwest: includes Creede Fm (tuffaceous siltstone, sandstone, conglomerate) and gravels interbedded with volcanic rocks northeast and southeast of Gunnison

— USGS

Taxonomy

Classified As

Geologic Formation

Oligocene sedimentary rocks (COTos;0)

Oligocene sedimentary rocks (COTos;0)

Oligocene sedimentary rocks (COTos;0)