North American Database of Archaeological Geophysics
North American Database of Archaeological Geophysics
Graphic/Image:
Project Name: 30-30 Winchester Site (48CA3030), WY;
Reference: http://www.archaeophysics.com/3030/index.html (used with permission).
Magnetic gradiometer data from the 30-30 Winchester Site. A cluster of several roughly circular magnetic highs appear in the southeastern part of the survey area, which is adjacent to the bank of the nearby creek. These anomalies were thought to be caused by hearths associated with the prehistoric occupation of the site. This was later confirmed by excavation. The high-amplitude bipolar anomaly near the center of the magnetic map was excavated as well, but no apparent source was discovered. Laboratory testing of soil samples and the geometry of the anomaly suggest that it may be an example of lightning-induced remanent magnetization.