NADAG: North American Database of Archaeological Geophysics

North American Database of Archaeological Geophysics

Image Library (by geophysical survey type): Electromagnetic Conductivity

(to view an enlargement of a graphic, click on it)

Project images sorted alphabetically by state or country; within each by site name

ARIZONA

La Ciudad

High conductivity anomaly mapped by the electromagnetic survey at the Hohokam site of La Ciudad in Phoenix;

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ARKANSAS

Lake Dumond

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;

Toltec Mounds Archeological State Park (3LN42), (2)

Soil conductivity results results in the area of Mound G showing a metallic debris field probably associated with an historic occupation;

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CALIFORNIA

Petaluma Adobe State Historic Park (CA-Son-2294/H)

Results of the electromagnetic conductivity survey at Petaluma Adobe State Historic Park;

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COLORADO

5LA9187

Conductivity data overlain on elevation map;

Sand Creek Massacre Site

Conductivity data from Sand Creek Village;

Twelve Mile House (5AH121)

Out-of-phase (conductivity) component plot for EM-31;

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GEORGIA

Fort Stewart (Durrence Cemetery)

Isolated conductivity anomalies interpreted as metal objects and other unknown features;

Upatoi Town (9ME395)

Conductivity image, Upatoi Town, GA;

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ILLINOIS

Cahokia Mounds State Historic Site (1)

Conductivity measurements on lines 1 and 2;

Conductivity measurements on lines 3 and 4;

Cahokia Mounds State Historic Site (2)

EM31 transects across a well-defined mound;

EM conductivity map of the Grand Plaza prepared using Surfer (version 3.0);

Cahokia Mounds State Historic Site (4)

Geonics EM38 conductivity meter contour and image data plots;

Fort de Chartres

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

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IOWA

Daw Farm

Conductivity with contour lines overlain image map;

Effigy Mounds National Monument (3)

Electromagnetic conductivity image, Conical Mound 45, Effigy Mounds National Monument, IA;

Plum Grove Historic House Site

Conductivity data at Plum Grove Historic House;

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KANSAS

Army City (2)

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.

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)

Conductivity data from Fort Larned;

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MICHIGAN

2002 Western Michigan University archaeological field school

Electrical Conductivity Data

MINNESOTA

Medicine Lake Mounds (21HE0068)

Conductivity image, Medicine Lake Mounds, MN;

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MISSISSIPPI

Hollywood Mounds Site (22TU500)

Conductivity survey of the Hollywood site with contour overlay;

Gradiometer data superimposed on the conductivity data;

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MONTANA

Last Stand Hill (horse cemetery)

Conductivity image showing a pipe feature, modern trash, and a rectangular shaped anomaly along the western edge that may be from a burial pit;

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NEBRASKA

Fort Atkinson (25WN9) (2)

Conductivity image, Fort Atkinson, NE;

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NEW JERSEY

Walton Cemetery

Results of the EM-38 conductivity survey shows many anomaly highs scattered across the site including the known grave of John Walton at 85E, 200N.

Results of the EM-61 survey reveal three anomalies at 86E, 196N; 106E, 198N; 186E, 140N.

NEW MEXICO

Escondido Pueblo (FB9569)

Circular trends appear in the unprocessed conductivity data possibly representing adobe pitstructures

Close-up of conductivity data and GPR data showing an adobe structure. Adobe, which is highly conductive is represented by black. Why does the entire roomblock visible in GPR (made of adobe) not appear in conductivity?

NORTH DAKOTA

Double Ditch Indian Village State Park (32BL8)

Electromagnetic conductivity image showing features and interpretations at Double Ditch Village State Park, ND;

Fort Clark Trading Post (32ME2)

Soil conductivity results from Fort Clark Trading Post, ND;

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OHIO

Kettering Shaker Cemetery

Conductivity image from the Kettering Shaker cemetery;

P Street Mound

A conductivity profile across the P Street mound;

River Bank Stabilization Project (Hopewell Mound Group)

Conductivity from band stabilization project.

Geophyscial data from grid unit 4.

Geophysical data from grid units 31 and 38.

Wright Memorial Mounds

Conductivity image of Mound 1, Wright Memorial Mounds, Ohio;		Deep conductivity at Mound 2, Wright Memorial Mounds, Ohio;		Shallow conductivity at Mound 2, Wright Memorial Mounds, Ohio;
Shallow conductivity at Mound 6, Wright Memorial Mounds, Ohio;

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OKLAHOMA

Deer Creek Site (34KA3) (1)

Conductivity measurements were made at 2 m intervals along this 250 m line at Deer Creek;

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SOUTH DAKOTA

Steamboat North Alabama

Electromagnetic conductivity survey results;

Whistling Elk Village (39HU242)

The results of the electromagnetic conductivity survey at Whistling Elk Village, SD;

Data fusion of three geophysical surveys at Whistling Elk Village, SD, achieved through RGB color compositing;

Cultural interpretations at Whistling Elk Village, SD, achieved through comparison of resistivity, conductivity, and magnetic data sets;

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UTAH

42BO683

Results of the conductivity survey at site 42BO683;

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VIRGINIA

Fort Morton (Petersburg National Battlefield)

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;

Jamestown Island (Brewhouse Area)

A fast conductivity exploration of the area;

Taylor House (Petersburg National Battlefield)

An average of two EM31 surveys;		A surface map of EM31 conductivity;		A smoothed EM38 conductivity map of the Taylor House;
A surface map of the EM38 conductivity;