Arkose is a detrital sedimentary rock, specifically a type of sandstone containing at least 25% feldspar. The Dawson Arkose is a geologic formation in the Denver Basin that underlies the Denver area in Colorado. It is characterized by alternating beds of arkosic sandstone and mudstone. The Dawson Arkose contains plant remains and other non marine fossils, and hosts aquifers that are important sources of water for the area. Pulpit Rock, near Colorado Springs, is made up of the Dawson formation.

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