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Excavations at the upper component of the Tule Creek site (CA–SNI–25), dating between approximately 600–350 cal BP, yielded numerous well-preserved sandstone abraders referred to as saws. Many of these tools show heavy use-wear and abundant white residue still adhering to the surface. We used X-ray diffraction (XRD) analysis to characterize the residue from two of the abraders, which identified the...