Structural Measurement Atlas
Atlas / States / Pennsylvania

Pennsylvania strike and dip data

29,970 structural measurements in Pennsylvania, digitized from 69 published geologic maps across 5 sources. Every row carries its azimuth, inclination, measurement type, location confidence and the citation of the map it came from.

Open Pennsylvania on the map

What kinds of measurement

The Atlas separates planar structures, recorded as a strike and dip, from linear ones, recorded as a trend and plunge. This is what Pennsylvania holds:

Measurement typeGeometryMeasurementsShare
Bedding Planar — strike and dip 11,40938%
Joint Planar — strike and dip 7,90326%
Other Planar — strike and dip 6,59022%
Cleavage Planar — strike and dip 1,8776%
Lineation (mineral, stretching) Linear — trend and plunge 1,3434%
Foliation Planar — strike and dip 5392%
Slickenline Linear — trend and plunge 133<1%
Fault plane Planar — strike and dip 76<1%
Fold hinge / axis Linear — trend and plunge 74<1%
Vein / dike Planar — strike and dip 26<1%

Where the data comes from

Each source is a survey, agency or program whose published mapping was harvested and reconciled into one schema. Rows are published only where the source's terms permit redistribution.

SourceMeasurementsShare
USGS NGMDB GeMS 12,04840%
Pennsylvania Geol. Survey 11,35538%
NPS GRI parks 6,22421%
NGMDB legacy quads 3261%
USGS data releases · MRDS 17<1%

Most-measured published maps

The individual quadrangles and data releases contributing the most measurements in Pennsylvania. The full citation for every map behind a selection ships in the sources.csv of any export.

Published mapYearScaleMeasurements
Open-File bedrock geologic maps with GIS data: OFBM series 2004-2013 (30 quads), OF 26-01.0 Northern Anthracite Field (13 quads, 2026), plus 1995 OF bedrock reports and OFMR 13-01.0— 1:24,000 (OFBM 05-01 Wilmington is 1:100,000 30x60-min compilation)8,922
adapted from: Alvord, Donald C., and Drake, Avery Ala Jr., 1971, Geologic Map of the Bushkill Quadrangle, Pennsylvania and New Jersey: U.S. Geological Survey, Geologic Quadrangle Map GQ-908, scale 1:24,0002021 240002,246
Doden, A.G., 2004, Draft Bedrock Geologic Map of the Burnham Quadrangle: Pennsylvania Geological Survey, 4th ser., unpublished map on file, scale 1:24,000, 1 sheet.2024 1:48,0001,683
Inners, J.D., 1981, Geology and mineral resources of the Bloomsburg and Mifflinville quadrangles and part of the Catawissa quadrangle, Columbia County, Pennsylvania, Pennsylvania Geological Survey, Atlas 164cd, 1:24,000.1981 1:24,0001,578
Way, J.H., 1993, Geology and mineral resources of the Washingtonville and Millville quadrangles, Montour, Columbia, and Northumberland Counties, Pennsylvania, Pennsylvania Geological Survey, Atlas 154cd, 1:24,0001993 1:24,0001,468
Doden, A.G. and Gold, D.P., 2008, Bedrock Geologic Map of the McAlevys Fort Quadrangle, Huntingdon, Centre, and Mifflin Counties, Pennsylvania: Pennsylvania Geological Survey, 4th ser., Open-file Bedrock Map 08-02.0, scale 1:24,000, 1 sheet, 22 p.2024 1:48,0001,361
Inners, J. D., 1997, Geology and mineral resources of the Allenwood and Milton quadrangles, Union and Northumberland Counties, Pennsylvania1997 1:24,0001,161
Pennsylvania Geological Survey from fieldwork by A.D. Bierly2024 1:24,0001,105
Behr, Rose-Anna, and Skema, V. W., 2022, Bedrock geology of the Far-randsville quadrangle, Clinton County, Pennsylvania: Pennsylvania Geological Survey, 4th ser., Atlas 22–003.0, 42 p. plus appendices, 1 map, scale 1:24,000, geodatabase.2022 1:24,0001,068
adapted from: Epstein, Jack B., 1990, Geologic Map of the Saylorsburg Quadrangle, Monroe and Northampton Counties, Pennsylvania: U.S. Geological Survey, Geologic Quadrangle Map GQ-1638, scale 1:24,0002021 240001,009
adapted from: Epstein, Jack B., 1973, Geologic Map of the Stroudsburg Quadrangle, Pennsylvania and New Jersey: U.S. Geological Survey, Geologic Quadrangle Map GQ-1047, scale 1:24,0002021 24000874
Inners, J. D., 1978, Geology and mineral resources of the Berwick quadrangle, Luzerne and Columbia Counties, Pennsylvania, Pennsylvania Geological Survey, Atlas 174c, 1:24,000.1978 1:24,000853
adapted from: Sevon, W.D., Berg, Thomas M., and Schultz, Lane D., 1989, Geology and Mineral Resources of Pike County, Pennsylvania: Pennsylvania Geological Survey, County Report 52, 141p., plate 1 (Bedrock Geologic Map), scale 1:50,0002023 50000828
adapted from: Sevon, W.D., Berg, Thomas M., and Schultz, Lane D., 1989, Geology and Mineral Resources of Pike County (Bedrock Geology Plate), Pennsylvania: Pennsylvania Geological Survey, 4th ser., County Report 52, 141p., scale 1:50,0002021 50000788
Aaron D. Bierly, Pennsylvania Geological Survey2023 1:24,000756

Most-measured map units

Where a source recorded the geologic unit a measurement was taken on, the Atlas keeps it. These are the units carrying the most measurements in Pennsylvania.

Map unitAgeLithologyMeasurements
Mahantango Formation, Lower Member Dml Middle DevonianMudstone703
Trimmers Rock Formation Dtr Upper DevonianSandstone and mudstone690
Mauch Chunk Formation Mmc MississippianSandstone and mudstone618
Keefer and Rose Hill Formations, undivided Skr Lower SilurianSandstone and mudstone523
Pl ——516
Wills Creek Formation Swc Upper SilurianMostly mudstone457
Bloomsburg and Mifflintown Formations Sbm Lower to Upper SilurianSandstone and mudstone444
middle member of the Stockton Formation Trsm TriassicSandstone387
Dcd ——364
Tuscarora Formation St Lower SilurianSandstone364
Irish Valley Member, Catskill Formation Dciv Upper DevonianSandstone and mudstone357
Bellefonte Formation Obf Middle OrdovicianDolomite352

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