North American Database of Archaeological Geophysics

Image Library (by geophysical survey type): Magnetic Methods (passive)

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

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

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;

Bozeman Cemetery

Magnetic gradiometry image showing principal iron artifact derived anomalies and a trail feature at Bozeman Cemetery, AR;

Des Arc Harbor Survey

Magnetic contour map (20 nT interval) showing anomalies in the White River;

Dike, Revetment, and Weir Construction Survey

Eaker Site (3MS105)

Total magnetic field results from "segment one" grids at site 3MS105;		Total magnetic field results from "segment four" grids at site 3MS105;		Total magnetic field results from "segment eight" grids at site 3MS105;
Total magnetic field results from "segment nine" grids at site 3MS105;

Greenbrier Site (3IN1)

Magnetic image, Greenbrier Site, AR;

Magnetic image, Greenbrier Site, AR;

Island 86 Survey

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;

Mount Comfort Church

The basic shape of the structure can be seen in the magnetic data, probably due to the higher magnetic susceptibility of remnant bricks;

Ouachita River Shipwrecks Survey

Pea Ridge Leetown Battlefield

Portion of a magnetic image from the survey done at Pea Ridge Battlefield, click image to see complete image;

Comparison of magnetic image to artifacts discovered during metal detecting survey;

Hypothetical distribution of ferrous metal artifacts based on magnetometry results;

Toltec Mounds Archeological State Park (3LN42), (1)

Magnetic image, Toltec Site, AR;

Magnetic image, Toltec Site, AR;

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

Magnetic gradiometry results in the area of Mound G showing a distribution of ferrous metal debris probably from an historic occupation;

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CALIFORNIA

CA-ORA-116

Results of the magnetic survey showing data within the expected range of prehistoric features at site CA-ORA-116;

Locations of high amplitude magnetic anomalies which are caused by historic iron debris;

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

Results of the alkali-vapor gradiometer survey at Petaluma Adobe State Historic Park;		Comparison of alkali-vapor gradiometer images by resolution;		Comparison of proton precession gradiometer image to proton precession magnetometer images created with different sensor heights;
Comparison of alkali-vapor magnetometer images by sensor height;		Comparison of diurnally-corrected alkali-vapor magnetometer images;

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COLORADO

5LA9187

Magnetic gradient data overlain on elevation map;

5ME6489

Magnetic image showing possible hearth features at Sieber Flat (5ME6489), Mesa County, CO.

5MT2848

Gray-scale SYMAP (colorized) magnetic map of site 5MT2848, Dolores Archaeological Program, Colorado, with pit-house anomaly at 17 to 25 N, 14 to 21 E, contour interval of 1 nT in midscale;

Fort Crawford Cemetery

Gradiometer data picked up the outline of an apparent encloser that may represent the outline of the Fort Crawford Cemetery.

Magic Mountain (5JF223)

Results of the magnetic survey at Magic Mountain;

Sand Creek Massacre Site

Magnetic gradient data from Sand Creek Village;

Twelve Mile House (5AH121)

Gradient field plot for magnetometer;

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FLORIDA

Shipwreck Catalina

Ferrous distribution of the shipwreck (shaded area) as determined by the magnetic anomalies;

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GEORGIA

Fort Stewart (Durrence Cemetery)

A well defined magnetic anomaly caused by a feature;

Kasita Town (9CE1)

Magnetic data revealing possible ditches

Adjusted contrast on the magnetic data shows possible burned structure foundations with hearths

Mission Santa Catalina de Guale

Magnetic contour map of Quad IV, Santa Catalina de Guale;		Three-dimensional magnetic map of Quad IV, Santa Catalina de Guale;		Three-dimensional magnetic map of nine quadrangles at Santa Catalina de Guale;
SYMAP rendering of magnetic profile of Quad IV, Santa Catalina de Guale;

Upatoi Town (9ME395)

Magnetic image, Upatoi Town, GA;

Magnetic image, Upatoi Town, GA;

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Illinois

Cahokia Mounds State Historic Site (4)

Geometrics G-858 cesium gradiometer contour and image data plots

Geoscan Research FM36 fluxgate gradiometer contour and image data plots;

Grossmann Site

Image showing magnetic anomalies;

Magnetic image with interpretations. About 60% of the structures and 40% of other features were detected;

Pfeffer Site

Image showing magnetic anomalies;

Magnetic image with interpretations. Red rectangles are structures, yellow circles are pits, and white lines indicate limit of mechanized stripping of plow zone.

Cahokia Mounds State Historic Site (3)

Surfer contour map of magnetic data.

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INDIANA

Bellinger Mound (12SJ6)

Magnetic image with elevation contour overlay (0.1 m interval);

Goodall Site (12LE9)

Magnetic survey grids on Mound 15 with superimposed elevation contours (0.1 m interval);

Magnetic survey grids on Mounds 17 and 18, with superimposed elevation contours (0.1 m interval);

Mud Lake Site (12LE14)

Magnetic survey grid over the Eastern Mound with an elevation contour overlay (0.1 m interval);

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IOWA

Daw Farm

Magnetic gradiometer data with contour lines overlain image map;

Effigy Mounds National Monument (3)

Magnetic image, Conical Mound 45, Effigy Mounds National Monument, IA;

Effigy Mounds National Monument (4)

Magnetic image, Great Bear, Mound 31, Effigy Mounds National Monument, IA;

Magnetic image, Little Bear, Mound 52 Effigy Mounds National Monument, IA;

Magnetic image, bird effigy, Mound 81 Effigy Mounds National Monument, IA;

Effigy Mounds National Monument (5)

Magnetic gradient of the Little Bear Mound;		Magnetic gradient of the Conical Mound;		Magnetic gradient of the Linear Mound;
Highlighted features at the Linear Mound;

Gunzenhauser Site (13DT110)

Magnetic data from the Gunzenhauser Site;

Hitchcock House and Cabin (13CA46 and 13CA47)

Interpretations of magnetic gradient data from the Hitchcock cabin project area;

Plum Grove Historic House Site

Magnetic gradient data at Plum Grove Historic House;

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KANSAS

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.

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

Magnetic gradient data from Fort Larned;

Bogan Site (14GE1)

Magnetic gradient data from the Bogan Site clearly showing three houses;

Fort Scott National Historic Site (1)

Contoured magnetic gradiometer data from Grid 1;

Shade plot of the magnetic gradiometer data from Grid 1;

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MICHIGAN

2002 Western Michigan University archaeological field school

Magnetic gradient data

Fort Wilkins State Park

Guard house magnetic gradient data;

Carpenter shop and blacksmith magnetic gradient data;

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Pointe Aux Barques Lighthouse

Magnetic Susceptibility image in the area of a lighthouse foundation

Resistance image with magnetic susceptibility overlay.

MINNESOTA

Wuamett Farmstead

Magnetic gradiometry image showing overall anomalies in vicinity of farmyard, Wuamett Farmstead, MN;

Magnetic gradiometry image showing principal large anomalies in farmyard, Wuamett Farmstead, MN;

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MISSISSIPPI

Dike, Revetment, and Weir Construction Survey

Hollywood Mounds Site (22TU500)

Magnetic gradiometer survey of the Hollywood site with contour overlay;

Magnetic gradiometer image of a Mississippian period wall trench house;

Gradiometer data superimposed on the conductivity data;

Island 86 Survey

Contour map of magnetic survey alignment of Dike No. 4 on the Mississippi River near Islands 86 and 87;

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MISSOURI

Iliniwek Village State Historic Site (1)

Magnetic survey data from the Iliniwek Site;

Magnetic contour data overlain on resistance image data;

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MONTANA

Last Stand Hill (horse cemetery)

Magnetic image showing several anomalies probably related to modern park refuse;

Interpretations of magnetic gradient and conductivity anomalies;

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NEBRASKA

Ponca Cemetery

Ponca Tribe Cemetery, Block D, magnetic map with grave marks;

Ponca Tribe Cemetery, magnetic survey, Blocks A, B, and C;

Fort Atkinson (25WN9) (2)

Magnetic image, Fort Atkinson, NE;

Magnetic image, Fort Atkinson, NE;

Magnetic image, Fort Atkinson, NE;

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NEW JERSEY

Walton Cemetery

A Combined plot of magnetic anomalies, possible headstones, and rocks.

NEW MEXICO

Adobe Pueblo Site (LA107488)

Magnetic image of the low rubble mound at Adobe Pueblo, from a fluxgate gradiometer;		Magnetic image of the low rubble mound at Adobe Pueblo, from a cesium magnetometer;		A magnetic contour map and three-dimensional surface plot of grid including Test Unit 1, from a fluxgate gradiometer;
A magnetic contour map and three-dimensional surface plot of grid including Test Unit 1, from a cesium magnetometer;

Archaic Site (LA108027)

Magnetic image of survey grid at the Archaic Site, from a cesium magnetometer;

Magnetic image of survey grid at the Archaic Site, from a fluxgate gradiometer;

Aztec Ruin (LA1674)

Magnetic image showing planned road and anomalies of unknown structures;

Camp Lewis (Pecos National Historic Park)

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

Chetro Ketl (Chaco Canyon National Monument)

Contour map of magnetic values in the Chetro Ketl field and surrounding area;

Cloudblower Site (LA89364)

Magnetic image of survey grids at the Cloudblower Site, from a cesium magnetometer;

Magnetic image of survey girds at the Cloudblower Site from a fluxgate gradiometer;

Cobble Pueblo Site (LA84429)

Magnetic image of survey grids at the Cobble Pueblo Site, from a fluxgate gradiometer;		Magnetic image of survey grids at the Cobble Pueblo Site, from a cesium magnetometer;		A magnetic contour map and three-dimensional surface plot of grids at the Cobble Pueblo Site, from a fluxgate gradiometer;
A magnetic contour map and three-dimensional surface plot of grid surveyed at the Cobble Pueblo Site, from a cesium magnetometer;

Escondido Pueblo (FB9569)

Magnetic gradiometry survey results. Faint hints of linear features are evident throughout, most likely adobe walls of enhanced magnetic susceptibility

Close up view of a likely burned structure found with the magnetic instrument

Pithouse Site (LA53672)

Magnetic image of survey grids at the Pithouse Site, from a fluxgate gradiometer;		Magnetic image of survey grids at the Pithouse Site, from a cesium magnetometer;		A magnetic contour map and three-dimensional surface plot of the Test Unit 1 locality at the Pithouse Site, from a fluxgate gradiometer;
A magnetic contour map and three-dimensional surface plot of the Test Unit 1 locality at the Pithouse Site, from a cesium magnetometer;

San Marcos Pueblo Historic Mission (LA98)

Combined resistivity and magnetic field gradient data collected over the site of the historic mission at Pueblo San Marcos;

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NEW YORK

Sylvester Manor

Magnetic map in the vicinity of Sylvester Manor, Shelter Island, NY;

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NORTH DAKOTA

Big Hidatsa (Knife River Indian Villages National Historic Site)

Composite gray-scale (colorized) map of Big Hidatsa Village, scale interval 2 nT;

Double Ditch Indian Village State Park (32BL8)

Magnetic gradiometry image showing features and interpretations at Double Ditch Village State Park, ND;

Flaming Arrow (32ML4)

Magnetic image, village features and interpretations, Flaming Arrow Village, ND;

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;

The Garden Coulee Site (32WI18)

magnetic data and artifact density overalaid on the results of the resistivity survey;

Huff Village State Historic Site (32MO11)

Aerial photograph of Huff Village with the 20 x 20 m magnetic survey grids superimposed;

Magnetic survey results at Huff Village with interpreted features and surface house depressions indicated;

A comparison of houses excavated by W.R. Wood in the 1960s at Huff Village with the magnetic data;

Menoken Village State Historic Site (32BL2)

Magnetic gradiometry survey results at Menoken Village, ND;		Magnetic detail of burned houses at Menoken Village, ND;		Comparison of digital elevation and magnetic data at a burned house at Menoken Village, ND;
Detail of the magnetic gradiometry survey at Menoken Village, ND, showing a portion of the fortification ditch;		Correspondence of magnetic findings with excavation profile;		Correspondence of magnetic and resistance data with burned earth weight as revealed by excavations at House 17;

Mit-tutta-hang-kush Village (Fort Clark State Historic Site, 32ME2)

Contemporary vertical aerial photograph showing Mit-tutta-hang-kush Village, ND, and geophysical survey transect;		Magnetic image of 400 x 20 m transect through Mit-tutta-hang-kush Village, ND, showing principal cultural features;		Detail from magnetic transect through Mit-tutta-hang-kush Village, ND, showing fortification ditch and circular house with numerous iron artifacts;
Detail from geophysical survey transects through Mit-tutta-hang-kush Village, ND, showing magnetic results at the large Arikara ceremonial lodge;

On-A-Slant Village (32MO26) (1)

Geophysical survey results in the earthlodge survey area;

On-A-Slant Village (32MO26) (2)

Results of the magnetic survey of an earthlodge;

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;

Ward Village (32BL3)

Magnetic gray-scale image (colorized) and 3D surface plot, 3 surface house depressions, Ward Village, ND;

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OHIO

Great Hopewell Road

Results of magnetic survey;

Kettering Shaker Cemetery

Magnetic image from the Kettering Shaker cemetery;

River Bank Stabilization Project (Hopewell Mound Group)

Magnetic gradient data from bank stabilization project area and outlined anomalies which are targets for future archaeological research.

Geophyscial data from grid unit 4.

Geophysical data from grid units 31 and 38.

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OKLAHOMA

Odessa-Yates (34BV100)

Magnetic data from the eastern survey area at the Odessa-Yates Site in 2000;		Magnetic map of Feature 2000-1;		Combined resistance and magnetic data from the 2000 season at the Odessa-Yates Site;
Combined map of magnetic and resistance data from the 1998 season at the Odessa-Yates Site;

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OREGON

Corvallis Historic Water Front Site

Shaded relief plot of the magnetic survey results;

Interpretive map of the magnetic survey results;

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;

Siletz Cemetery

Color image plot of the vertical magnetic gradient with the locations of four marked graves identified;

Overlay of the magnetic data and GPR data with the locations of four marked graves identified;

8-bit color image from the RGB grayscale images of the survey data;

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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;

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SOUTH CAROLINA

38SU45

Magnetic image, 38SU45, Sumter County, SC;

38SU147

Magnetic image, 38SU147, Sumter County, SC;

Magnetic image, 38SU147, Sumter County, SC;

38SU215

Magnetic image, 38SU215, Sumter County, SC;

38SU232

Magnetic image, 38SU232, Sumter County, SC;

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

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SOUTH DAKOTA

Whistling Elk Village (39HU242)

The results of the magnetic gradiometry survey at Whistling Elk, SD;		Magnetic data showing the central hearth, at least 3 central support posts, and extensive burning along the walls of an unusually large house 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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TEXAS

41CN95

Contour plot of the magnetic field for prospection grid 1 at 41CN95, O.H. Ivie Reservoir;

41HF8

Contour plot of the magnetic field for prospection grid 1 at 41HF8, Palo Duro Creek Reservoir;

41KT53

Contour plot of the magnetic field for prospection grid 2 at 41KT53, Justiceburg Reservoir;

41RN169

Contour plot of the magnetic field for prospection grid 1 at 41RN169, O.H. Ivie Reservoir;

Black Cloud Steamboat

Magnetic contour map of the "Black Cloud" shipwreck location in the Trinity River;

Kaufman-Roitsch (41RR16)

Magnetic results at the Kaufman-Roitsch Site, TX, revealing numerous dipole anomalies representing historic iron and recent steel debris;

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UTAH

42BO681

Results of the magnetic survey at site 42BO681;

42BO683

Results of the magnetic survey at site 42BO683;

42TO1009

Results of the magnetic survey at site 42TO1009;

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VIRGINIA

Burroughs Cemetery (Booker T. Washington National Monument)

Magnetic anomalies possibly relating to the nineteenth century boyhood home of Booker T. Washington;

Falling Creek Ironworks (44CF7)

Magnetic survey results clipped at +- 3 standard deviations to emphasize extremely high amplitude large-scale anomalies;

Magnetic survey results clipped at +- 0.5 standard deviations to display subtle anomalies;

Fort Morton (Petersburg National Battlefield)

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;

Historic Slave Quarters Core Area (Booker T. Washington National Monument)

Magnetic gradiometer data from the Historic Slave Quarters Core Area;

Jamestown Island (Brewhouse Area)

Magnetic gradiometer data at the Brewhouse Area;

St. George Tucker House

Magnetic survey at the location of a stone circle which might have marked a small goldfish pond;

Magnetic map of a small area at the Tucker House;

Taylor House (Petersburg National Battlefield)

A magnetic contour map of the Taylor House (5 and 10 nT contours);

A fast, low resolution magnetic survey of the Taylor House (5 and 10 nT contours);

A magnetic contour map of the Taylor House measured with a magnetic gradiometer (10 nT contours);

Yorktown

Results of the magnetic survey;

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WASHINGTON

Fort Vancouver, Washington (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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WEST VIRGINIA

Merritt Cemetery

Magnetic image showing metal anomalies, prehistoric hearths, and other features. Reds indicate high (nT/m) and blues are low;

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WYOMING

30-30 Winchester Site (48CA3030)

Magnetic gradiometer data from the 30-30 Winchester Site;

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;

48TE1077

Contour map of magnetic survey grids (0.5 nT interval) showing possible Features A and B;

Three-dimensional surface plot of magnetic survey grids (0.5 nT interval);

48TE1078

Contour map of the magnetic survey grids ( 0.5 nT interval);

Three-dimensional surface plot of magnetic survey grids (0.5 nT interval);

48TE1079

48TE1080

Magnetic contour map (0.5 nT interval) showing previously excavated Test Unit B;

Magnetic 3D surface plot (0.5 nT interval) of study area;

48WE917

Results of a portion of the magnetic survey revealing a number of discrete clusters of anomalies;

Fort Caspar (48NA209)

Magnetic gradient data from Fort Caspar;

Fort Laramie National Historic Site

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

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;

Mitchell Site (48TE1375)

Magnetic contour map (0.5 nT interval) showing surface Feature A;

Magnetic 3D surface plot (0.5 nT interval) of area of surface Feature A;

Sand Draw Dump Site (48FR3123)

Wireframe and color contour images of magnetic anomalies;

Shaded plot of magnetic survey data, which shows a strong anomaly of possible hearth;

Contour plot of magnetic data;

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CANADA

New Brunswick

Fort Jemseg Geophysical Survey

Magnetic Gradiometer data revealing historic house foundation;

Mill Lake Island

Magnetic Survey of Mill Lake Island beach

Magnetic Gradiometer data showing the location of three prehistoric hearths;

St Paul's Cemetery

Magnetic Gradiometer data indicating marked and unmarked historic graves at St. Paul's Cemetery in New Brunswick, Canada;

Saskatchewan

Bushfield West (FhNa-10)

Relative magnetic relief of assessment grid, sensor at 20 cm;

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MEXICO

Veracruz

San Lorenzo

Total magnetic intensity contour map over a buried Olmec Altar (Monument 51);		Contour map of the magnetic intensity over a colossal Olmec head (Monument 61) that was buried at a depth of approximately 5 meters;		Contour map of total magnetic intensity of a grid containing a colossal Olmec head (Monument 53);
Total magnetic intensity contour map and perspective view of contoured data over an area described as a "workshop";

México

Teotihuacan

Total field magnetic anomaly map surveyed to the west of the Pyramid of the Sun;		Total field magnetic anomaly map reduced to the pole and a three-dimensional representation both from a grid surveyed to the west of the Pyramid of the Sun;		Total field magnetic anomaly map surveyed to the east of the Pyramid of the Sun;
Three-dimensional view of total field magnetic data reduced to the pole from a grid surveyed to the east of the Pyramid of the Sun;		Resistivity and magnetic profiles of TEO-1;		Resistivity and magnetic profiles of TEO-4;
Resistivity and magnetic profiles of TEO-5;

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