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Sandstone grinding mobile

Feb 24, 2021 Sourcing sandstone cobble grinding tools in southern . Oct 01, 2014 Sourcing sandstone cobble grinding tools in southern California using petrography, UPb geochronology, and Hf isotope geochemistry these acted as a ball mill to grind and physically disintegrate weaker clasts during flood transport Recognizing such instances of human transported cobble grinding tools in mobile

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