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https://geology.utah.gov/map-pub/survey-notes/glad-you-asked/moqui-marbles/
Glad You Asked: What are Moqui marbles? - Utah Geological Survey
Apr 14, 2026 - Moqui marbles are small, brownish-black balls composed of iron oxide and sandstone that formed underground when iron minerals precipitated from flowing...
glad you askedmoqui marblesutahgeologicalsurvey