Structural Measurement Atlas
Atlas / Sources / NGMDB legacy quads

NGMDB legacy quads

216,089 structural measurements in the Atlas come from NGMDB legacy quads, harvested across 460 published maps and data releases and reconciled into the Atlas schema.

Show only this source on the map

0% of this source's records state their own azimuth convention in the published data. Where a convention is not stated the Atlas infers it from the source's documented practice and records that it did so — which is why every row keeps a link back to the map it came from, and why a measurement that matters should be checked against that map.

What it contains

Measurement typeGeometryMeasurementsShare
Other Planar — strike and dip 82,74738%
Bedding Planar — strike and dip 79,09037%
Foliation Planar — strike and dip 36,00417%
Lineation (mineral, stretching) Linear — trend and plunge 8,7374%
Joint Planar — strike and dip 4,5792%
Cleavage Planar — strike and dip 1,820<1%
Fault plane Planar — strike and dip 1,736<1%
Fold hinge / axis Linear — trend and plunge 693<1%
Vein / dike Planar — strike and dip 460<1%
Slickenline Linear — trend and plunge 223<1%

Where it is

StateMeasurementsShare
California 60,94928%
Montana 27,13413%
Arizona 23,80211%
Idaho 10,7925%
Nevada 10,5665%
New Hampshire 9,4084%
Oregon 9,3074%
Washington 9,1464%
Virginia 6,7193%
Colorado 6,5683%
Connecticut 5,9933%
Wisconsin 5,7633%
Missouri 4,8012%
Maryland 3,1821%
New York 2,5101%
Vermont 2,3651%
Alaska 1,867<1%
North Carolina 1,833<1%
Massachusetts 1,545<1%
Arkansas 1,306<1%
West Virginia 1,085<1%
New Mexico 1,078<1%
Minnesota 1,027<1%
Michigan 789<1%
Tennessee 625<1%
South Carolina 490<1%
Wyoming 423<1%
Maine 399<1%
Utah 333<1%
Pennsylvania 326<1%
Ohio 260<1%
South Dakota 153<1%
New Jersey 87<1%
Rhode Island 53<1%
Indiana 48<1%
Nebraska 47<1%
Iowa 29<1%
District of Columbia 27<1%
Illinois 5<1%

Most-measured published maps

Published mapYearScaleMeasurements
Geologic map database of the Washington DC area featuring data from three 30 X 60 minute quadrangles: Frederick, Washington West, Fredericksburg2001 1:100,0004,533
Geologic map and database of the Roseburg 30' X 60' quadrangle, Douglas and Coos Counties, Oregon2000 1:100,0003,981
Quaternary geologic map of the Hudson River 4 degrees x 6 degrees quadrangle, United States and Canada1992 1:1,000,0003,393
Regional geologic map of San Andreas and related faults in Carrizo Plain, Temblor, Caliente and La Panza Ranges and vicinity, California: a digital database1999 1:125,0003,368
Tectonic map of southeast Arizona2002 1:125,0002,930
Geologic map of the Tillamook Highlands, northwest Oregon Coast Range: a digital database1995 1:62,5002,844
Bedrock geologic map of the Windham quadrangle, Rockingham and Hillsborough Counties, New Hampshire1999 1:24,0002,790
Bedrock geology of the Ellsworth and eastern part of the Amenia quadrangles, Connecticut and New York [Originally released in 1986 as M.S. Thesis, Univ. of Massachusetts, Amherst, MA]2019 1:24,0002,766
Geologic maps and structure sections of the southwestern Santa Clara Valley and southern Santa Cruz Mountains, Santa Clara and Santa Cruz Counties, California2001 1:24,0002,665
A geologic and mineral exploration spatial database for the Stillwater Complex, Montana2014 1:217,0002,521
Geologic map and map database of the Oakland metropolitan area, Alameda, Contra Costa, and San Francisco Counties, California2000 1:50,0002,372
Digital bedrock geologic map database of the Beatty 30 X 60-minute quadrangle, Nevada and California1999 1:100,0002,233
Geology of the Joshua Tree National Park geodatabase [San Bernardino and Riverside Counties, California]2015 1:12,0002,225
Geologic map of the Valle 30' x 60' quadrangle, Coconino County, northern Arizona2006 1:100,0002,199
Geologic map of the central San Juan caldera cluster, southwestern Colorado2006 1:50,0002,123

Most-measured map units

Map unitAgeLithologyMeasurements
su ——1,748
Aqfg ——1,174
sc ——859
Yab ——797
Om ——620
Kgd ——616
Yd ——522
Tmtr ——497
Ye ——483
SDhus ——477
ssp ——468
Ybge ——455

Other sources