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| Geophysical survey in progress, 2003 by archeologists from the University of Texas at Austin under the direction of Drs. Darrell Creel and Samuel Wilson. Here the archeologist is dragging as sensing device back and forth across the site at regular intervals. The sensors mounted on the lightweight wheeled framework detect subtle differences in the earth's near-surface magnetism. Magnetic disturbances created by pits and postholes dug by the ancient Caddo some 800 years ago can be detected with this equipment. Photo by Steve Black. |