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Upper part of Dawson Arkose

Arkosic sandstone, conglomerate, and shale. Includes Green Mountain Conglomerate south of Golden
StateColorado
NameUpper part of Dawson Arkose
Geologic agePhanerozoic | Cenozoic | Tertiary
Original map labelTdu
Primary rock typesandstone
Secondary rock typeconglomerate
Other rock typesshale
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Conglomerate
Sedimentary > Clastic > Sandstone > Arkose
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 coverageArapahoe - Douglas - Elbert - El Paso - Jefferson

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=COTdu;0
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