North American Database of Archaeological Geophysics

Graphic/Image:

Project Name: Effigy Mounds, IA (1);

Reference: Bevan, B. (1999). Some Geophysical Experiments at Effigy Mounds. Geosight, Weems, Virginia. Submitted to the Midwest Archeological Center, U.S. National Park Service, Lincoln, Nebraska.

Measurements of soil voltage. Two different electrodes were tested, and each test was repeated twice (traversing to the east at first, and then returning toward the west). These tests show the repeatability and drift of the electodes. The electrodes constructed of solid plaster gave measurements that were more repeatable but had a larger drift than the other electrodes; these other electrodes were manufactured by an engineering supply company, Tinker and Rasor.

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