North American Database of Archaeological Geophysics
North American Database of Archaeological Geophysics
Graphic/Image:
Project Name: Cahokia Mounds State Historic Site, IL (2);
Reference: Dalan, R.A. (1991). Defining Archaeological Features with Electromagnetic Surveys at the Cahokia Mounds State Historic Site. Geophysics 56(8):1280-1287 (used with permission).
EM conductivity map of the Grand Plaza prepared using Surfer (version 3.0). The buried ridge and swale topography is apparent as well as three possible filled borrow pits. Archaeological excavation confirmed the location of the sand ridge and adjacent swale and one of the borrow pits. Conductivity anomalies are also produced by Mounds 49 and 56.