North American Database of Archaeological Geophysics

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

AL
AR
AK
AZ
CA
CO
CT
DE
FL
GA
HI
IA
ID
IL
IN
KS
KY
LA
MA
MD
ME
MI
MN
MO
MT
MS
NC
ND
NE
NH
NJ
NM
NV
NY
OH
OK
OR
PA
RI
SC
SD
TN
TX
UT
VA
VT
WA
WI
WV
WY

ARKANSAS

Arkansas Post National Memorial

Position of magnetic survey blocks with respect to sidewalk;   Combined line contour and gray-scale (colorized) map of magnetic data;   Line contour magnetic map with linear features and anomaly groups marked;
Resistance map with anomalous area and linear feature marked;        

Lake Dumond

Gray-scale (colorized) map showing the results of the magnetic survey;   Magnetic contour map showing the results of the magnetic survey in Blocks A to N;   Gray-scale (colorized) map showing the results of the magnetic survey in Blocks Y and Z;
Contour map showing the results of both the magnetic and resistance surveys in Blocks A to N;   Contour map showing the results of the resistance survey (1 ohm interval);   Shaded contour map showing the results of the resistance survey in Block N;
Shaded contour map showing the results of the resistance survey in Block U;   Gray-scale (colorized) map of the conductivity, in milli-Seimans/m, for Block N;   Gray-scale (colorized) map of the conductivity, in milli-Seimans/m, for Block U;

Gray-scale (colorized) map showing the results of the magnetic susceptibility survey in Blocks Y and Z;

        

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

FLORIDA

Fort Martello

GPR Slice 2 from a historic site at Fort Martello;   GPR Slice 4 (about 1.75 meters depth) from a historic site at Fort Martello;    

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ILLINOIS

Fort de Chartres

A conductivity map of an area on the NW side of Fort de Chartres;        

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KANSAS

Army City (1)

Resistivity map of Army City;   Resistivity map of the Hippodrome Complex;   Resistivity map of a portion of the Southwestern Commercial District;
Resistivity map of the east-central portion of Army City;  

 

    

Army City (2)

Magnetic image showing ferrous metal anomalies such as pipes, nails, etc., which reveal outlines of structures at Army City, KS   A close-up of the magnetic data shows water and sewer lines as dipoles at pipe joints as well as the general distribution of iron litter.   Raw magnetic image showing possible zones of brick debris, intensive burning, topsoil mounding or extraction at Army City, KS
Close-up of magnetic susceptibility data with broad areas of high anomalies may represent burned areas from the great fire of 1921.   Conductivity image showing highly conductive buried pipes and building outlines at Army City, KS   Close-up of conductivity data shows highly conductive buried pipes as dipolar because instrument is saturated.
Overview of resistivity data at Army City, KS.   Vegetation marks of walls from the "Hippodrome" and resistivity image of area at Army City, KS.   Vegetation marks and resistivity image of building footers at Army City, KS.
Close-up of resistance data. High resistance areas (black) probably represents building materials like concrete, stone or brick.  

A preliminary view of GPR data based on a composite of time slices resulting from 8 individual sub-blocks needed to survey entire area.

   GPR data after filtering, GSSI Radan program was employed for slicing the data.
Color composite of five geophysical images for the same area using ground-penetrating radar, electrical resistance, soil conductivity, magnetic susceptibility and gradiometry,with each layer assigned a different color and made translucent        

 

Cavalry Stable Area, HS-35 (Fort Larned National Historic Site)

Magnetic gradient data from Fort Larned;  

Conductivity data from Fort Larned;

    

Fort Scott National Historic Site (1)

Contoured magnetic gradiometer data from Grid 1;   Shade plot of the magnetic gradiometer data from Grid 1;   Contour map of the resistivity data from Grid 1;
Contour map of the resistivity data from Grid 2;  

Contour map of the resistivity data from Grid 3;

    

Fort Scott National Historic Site (2)

The seismic measurements at Fort Scott;        

Fort Scott National Historic Site (3)

Results of depth response experiments with the Bartington Susceptibility Meter and Field Coil;   Measurements of volume magnetic susceptibility with the Bartington Susceptibility Meter and Field Coil;   Interpretation of resistivity sounding data;

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

MICHIGAN

Fort Wilkins State Park

Guard house magnetic gradient data;   Carpenter shop and blacksmith magnetic gradient data;   Guard house resistivity data;
Carpenter shop and blacksmith resistivity data;        

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NEBRASKA

Fort Atkinson (25WN9) (2)

Magnetic image, Fort Atkinson, NE;   Magnetic image, Fort Atkinson, NE;   Magnetic image, Fort Atkinson, NE;
Conductivity image, Fort Atkinson, NE;   Conductivity image, Fort Atkinson, NE;   Conductivity image, Fort Atkinson, NE;

Fort Robinson State Park

East-west electrical resistivity survey map with Barracks 56 archeological test units superimposed;   North-south electrical resistivity survey map with Barracks 56 archeological test units superimposed;    

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NEW MEXICO

Camp Lewis (Pecos National Historic Park)

Results of the magnetic survey at Camp Lewis, revealing linear trends directly associated with the Santa Fe Trail;        

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

 

NORTH DAKOTA

Fort Buford (State Historic Site)

Resistance image showing the enlisted barracks, mess hall, possible sink (latrine), and other anomalies;        

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OREGON

Fort Clatsop National Memorial

Fort Clatsop magnetic survey, all seasons, clipped at +/- 500 nT;   Fort Clatsop magnetic survey, all seasons, clipped at +/- 130 nT;   Fort Clatsop magnetic map showing the possible Smith house area;
1997 Fort Clatsop magnetic map showing the locations of previously excavated trenches;        

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PENNSYLVANIA

Valley Forge National Historical Park

High-resolution survey map (readings taken every meter) over hut site in M10;   High-resolution survey map (readings taken every quarter-meter) in excavation trench over the hut site in M10 after removal of tent pegs;   High-resolution survey map (readings taken every half-meter) in M8 showing linear anomaly caused by magnetic soil;
Radar profile in M17 showing difference in signal received from the backfilled half and the undisturbed half of an offal pit;        

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

VIRGINIA

Fort Monroe (44HT27)

GPR time slice 7 30-35ns where an anomaly possibly representing feature 2 is visible;        
A GPR transect diplayed as a profile revealing a possible feature previously excavated;      

Fort Morton (Petersburg National Battlefield)

A high frequency (315 MHz) antenna GPR profile over the trenches of the bombproofs at Fort Morton;   Radar echoes of the Bombproof;   GPR profiles of the Iron detail;
Contour map of the Fort Morton magnetic survey (2.5, 10, and 100 nT contours);   A surface plot of the magnetic field at Fort Morton;   A smoothed magnetic contour map of the Bombproof detail;
Magnetic contour maps of the Iron detail (100 nT contour interval);   Magnetic contour map showing objects behind the main fortification trench;   Magnetic gradiometer map of the Iron detail;
A smoothed EM38 conductivity map of Fort Morton;   A smoothed EM38 conductivity map of the Bombproof detail;   The EM31 conductivity of the Trench detail. This map reveals a lateral gradient and a line of lows near E500;
EM31 and EM38 conductivity maps of the small Iron detail;   A magnetic susceptibility contour map of the Iron detail measured with the EM38;   A smoothed resistivity map of the Bombproof detail;
A surface map of electrical resistivity;   A smoothed resistivity map of the Trench detail;   A resistivity contour map of the Iron detail;
Soil voltages at the Iron detail;   A self-potential profile across the main fortification trench;   A self-potential profile across the Bombproof detail;
A self-potential map made over the Iron detail area;   Examples of seismic signals at Fort Morton;   A seismic recording from 12 geophones;
Seismic refraction travel time at the Bombproof shelter;        

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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;

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WYOMING

Fort Caspar (48NA209)

Magnetic gradient data from Fort Caspar;   Conductivity data from Fort Caspar;    

Fort Laramie National Historic Site (1)

Magnetic/Resistance image, Fort Laramie National Historic Site, WY;   Resistance image, Fort Laramie National Historic Site, WY;    

Fort Laramie National Historic Site (2)

Conductivity image showing anomalies around hospital;   Archeological interpretation of major conductivity anomalies around hospital;    

Fort Phil Kearny Historic Site

Magnetic field gradient data with minimal processing;   Magnetic field gradient data that has been subjected to a standard deviation filter;    

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

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