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Eocene prevolcanic sedimentary rocks

South-central: Arkosic sand and bouldery gravel of Echo Park Alluvium. Southwest: includes Telluride Conglomerate and Blanco Basin Fm (arkosic mudstone, sandstone, and conglomerate)
StateColorado
NameEocene prevolcanic sedimentary rocks
Geologic agePhanerozoic | Cenozoic | Tertiary
Original map labelTe
Primary rock typesandstone
Secondary rock typeconglomerate
Other rock typesmudstone
Lithologic constituents
Major
Unconsolidated > Coarse-detrital > Gravelbouldery gravel
Sedimentary > Clastic > Sandstone > Arkose
Minor
Sedimentary > Clastic > Sandstone
Sedimentary > Clastic > Mudstonearkosic mudstone
Sedimentary > Clastic > Conglomerate
Map references
Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Unit references
Tweto, Ogden 1979, Geologic Map of Colorado: U.S. Geological Survey Special Geologic Map, scale 1:500,000.
Geographic coverageArchuleta - Conejos - Custer - Dolores - Fremont - Gunnison - Hinsdale - Mineral - Montrose - Ouray - Park - San Juan - San Miguel - Teller

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