Definition of "arkose" [ar•kose]

• A sedimentary rock consisting of small fragments of feldspar and quartz similar to a coarse sand. (noun)

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• "Uluru is composed of steeply dipping, feldspar-rich sandstone arkose and has been exposed as a result of folding, faulting, the erosion of surrounding rock and infill."
• "The Triassic rocks are mainly red sandstones, -- often feldspathic, or arkose, with some conglomerates and shales."
• "Pressure has hardened the marine muds, the arkose, or the volcanic ash from which slates are derived, and has caused them to cleave by the rearrangement of their particles."