Petroglyph Friday, You may have heard of "grinding slicks" throughout the park, which were used for sharpening tools by Ancestral Puebloan people. The tools in turn were used in chiseling, pecking, or carving petroglyphs. Grinding slicks can also be referred to as metates.pic.twitter.com/f2OhRicG0m
1:36 PM - 6 Mar 2020
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