North American Database of Archaeological Geophysics

Image Library (by archaeological site type): Historic/Non-Native Trading Post

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Project images sorted alphabetically by state or country; within each by site name and geophysical survey type

Conductivity GPR Induced Polarization Magnetic Magnetic susceptibility Metal detector Multiple Methods Seismic Refraction Self Potential Resistance/Resistivity

COLORADO

Bent's Old Fort National Historic Site

Resistivity data at 1 meter depth from a cemetery at Bent's Old Fort;

MICHIGAN

2002 Western Michigan University archaeological field school

Magnetic gradient data

GPR data

Electrical Conductivity Data

NORTH DAKOTA

Fort Clark Trading Post (32ME2)

Magnetic image showing the Fort Clark Trading Post, associated dumping ground and cemetery, and Garreau's lodge and compound;		Magnetic image from the Fort Clark Trading Post, ND, showing features in the Euroamerican cemetery;		Comparison of the magnetic findings with an historic sketch of the Fort Clark Trading Post;
Electrical resistivity results from Fort Clark Trading Post, ND;		Soil conductivity results from Fort Clark Trading Post, ND;		GPR results from a 30 x 20 m study block at Fort Clark Trading Post, ND;
Magnetic susceptibility results from Fort Clark Trading Post, ND;

Primeau's Trading Post (Fort Clark State Historic Site, 32ME2)

Magnetic results at Primeau's Trading Post (mid-19th century), near Washburn, ND, showing overall layout of the structure in gray scale (tinted blue) and as a stacked trace plot showing relative magnetic magnitudes;

Electrical resistance survey results at Primeau's Trading Post (mid- 19th century), near Washburn, ND, weakly showing the layout of the structure in gray scale (tinted red) and through shadowing of the raw data;

SOUTH CAROLINA

Silver Bluff Plantation (38AK7)

Magnetic data from the survey of the Silver Bluff Plantation shows the extent of historic iron artifact scatter		Close-up view of possible archaeological linear anomalies that can be seen after data processing		Linear features are apparent in the resistance data indicating possible wall foundations and roads
Three slices of GPR data reveal different feature types at different depths (plow scars, linear features, and structure foundations)

WASHINGTON

Fort Vancouver, Washington (1)

Image showing approximate location of survey grids and former structures;		Electrical resistance image after processing with despiking and a high-pass filter;		Orthographic projection of electrical resistance image;
Electrical resistance image after a large-radius, high-pass filter and interpretations of selected anomalies;		Possible location of a former structure, discovered through further image processing;		Interpretation of anomaly that may be a former structure;

Fort Vancouver, Washington (2)

Resistivity plot and model for data from resistivity line 1;	Resistivity plot and model for data from resistivity line 2;
Three-layer electrical stratification of resistivity line 1;	Three-layer electrical stratification of resistivity line 2;
Magnetic image showing possible locations of houses and linear anomalies;	Magnetic image showing possible locations of 2 houses and other anomalies;
Cultural interpretation of gradient magnetic data in Grid Units 1 and 2;	Cultural interpretation of gradient magnetic data in Grid Units 3 and 4;

WYOMING

48NA288 Seminoe's Fort

Colorized magnetic image of area surveyed. The U-shaped anomalies are the location of the fort area;

Close up magnetic image of fort area with interpretations;

Magnetic image of the survey area with interpretations;

Fort Laramie National Historic Site (2)

Conductivity image showing anomalies around hospital;

Archeological interpretation of major conductivity anomalies around hospital;

Fort Laramie National Historic Site (3)

Conductivity contour and image data plots collected at the fur trade and early military cemetery;		Conductivity contour and image data plots for the Ward-Guerrier Trading Post location;		Conductivity contour and image data plots for the Fort Laramie Cemetery;
Resistivity contour and image plots for the 0.5 probe separation distance;		Resistivity contour and image plots for the 1.0 probe separation distance;		VES resistivity plot and computer generated model;
Electrical stratification of VES data;		Image plots of the compaction data in Grid Unit Z62;		Pseudo-section lines along the 1.0 m traverse lines in Grid Unit Z62;

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