His most significant discovery came in 1938, when he discovered a pair of perfectly preserved shredded sagebrush bark sandals at Fort Rock in Oregon that were radiocarbon dated from 10,500 to 9,300 years old, making them the oldest footwear ever discovered.
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Luther Cressman, the first to explore the region, discovered preserved 9,000-year-old shredded sage sandals at Fort Rock Cave in south central Oregon, USA.