Archaeo-Physics, LLC - geophysical survey and subsurface mapping

Case Study

Falling Creek Ironworks

Electrical Resistance Survey

See also: Summary Page- Magnetic Survey - GPR Survey

The results of resistivity survey are presented graphically as color image maps. Resistance values close to the mean are displayed as shades of gray, the lighter shades representing areas of relatively low resistivity and the darker shades representing areas of relatively high resistivity. Areas of extremely high and low resistivity are shown in color. This allows the values near the mean to be displayed with greater contrast, revealing more subtle detail than if the entire range of data were shown in grayscale.

Anomalies of interest are outlined on the map, and discussed in descending order of precedence below.

resistance / resistivity survey of colonial ironworks

1. A series of linear high resistance anomalies, many of which form rectangular features are outlined in purple. This region of rectangular anomalies is located between 80E and 120E. Remains of architectural features may be the source of these anomalies, possibly buildings related to the iron works such as worker housing.

2. A distinct linear resistance high centered at 40N, 60E is also outlined in purple. This linear anomaly may also be related to linear archaeological or architectural features associated with the iron works.

3. Two distinct parallel linear anomalies centered at 26N, 77E are outlined in light blue. These linear anomalies are well defined and have spatial correlation with linear magnetic anomalies discussed below. The source of these anomalies may be linear archaeological features.
There are also numerous, less distinct, linear resistance anomalies present in the resistance data that were not outlined, particularly in the area between 10E and 40E. Any of these linear anomalies may be associated with archaeological features. A dam, which can be seen on the banks and in the bed of the creek, may extend south across the terrace. Although it does not appear distinctly in the resistance data, this might be the origin of some of these resistance anomalies. They might also be of geologic origin or due to modern earth moving or other activities. The extremely high resistivity values seen throughout the northern edge of the survey area appear to be due to changes in moisture content associated with variations in soil type and degree of soil consolidation.

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