They resemble impact craters formed by meteorites, but lack the heavy metal signature residues of space objects.
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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In 1984, the Oregon Historical Society published a review of Pioneer Homesteaders of the Fort Rock Valley in the Oregon Historical Quarterly, the society’s premier history journal.