North American Database of Archaeological Geophysics
North American Database of Archaeological Geophysics
Graphic/Image:
Project Name: Plum Grove Historic House Site, IA;
Reference: De Vore, S. L. (1999). Magnetic Gradient and Electromagnetic Conductivity Investigations of the Plum Grove Historic House Site, Johnson County, Iowa. National Park Service, Intermountain Support Office-Santa Fe. Prepared for the State Historica Society of Iowa, Des Moines, Iowa.
Conductivity data at Plum Grove Historic House. The conductivity data identifies a number of the modern disturbances including the water/utility lines, the garden fence, the drive and parking lot, and brick sidewalk. There is a linear high conductive area leading away from the north side of the house towards the entrance gate. There is also a low conductivity area surrounding the house, which appears to be similar to the concentration of magnetic anomalies adjacent to the house.