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Moqui Marbles found on Spencer Flats in Utah
In the US, they are commonly called Moqui Marbles after the Moqui Indians who inhabited the lands where they are found. Found during the excavation of ancient ruins around the world, some archeologists believe they have been used for centuries by Shamans and other mystics. There are various theories about how they were formed. Some geologists believe them to be ironstone concretions formed 130 to 155 million years ago.