North American Database of Archaeological Geophysics
North American Database of Archaeological Geophysics
Graphic/Image:
Project Name: Twelve Mile House (5AH121), CO;
Reference: De Vore, S.L. (1992). Geophysical Applications in Archaeology: A Case Study at the Twelve Mile House (5AH121), Arapahoe County, Colorado. Southwestern Lore 58(1):1-16 (used with permission).
Out-of-phase (conductivity) component plot for EM-31. One anomalous area correlated with the tentatively identified stone-cased well located at 90N/165E during the magnetometer survey. A large anomalous area, located between 150N-270N and 90E-180E, identified on both the total magnetic field and the soil conductivity plots, represented a shallow surface depression. There was also a general trend for the soil conductivity to increase to the northeast. The in-phase component indicated the presence of several anomalous areas, including point sources located at 150N/270E and 270N/135E, and a linear area along 120N-180N/165E.