Structural Measurement Atlas
Atlas / States / Washington

Washington strike and dip data

77,518 structural measurements in Washington, digitized from 623 published geologic maps across 7 sources. Every row carries its azimuth, inclination, measurement type, location confidence and the citation of the map it came from.

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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 Washington holds:

Measurement typeGeometryMeasurementsShare
Bedding Planar — strike and dip 41,84354%
Foliation Planar — strike and dip 21,77228%
Lineation (mineral, stretching) Linear — trend and plunge 4,9986%
Fault plane Planar — strike and dip 2,9584%
Joint Planar — strike and dip 2,1923%
Fold hinge / axis Linear — trend and plunge 1,3172%
Other Planar — strike and dip 8971%
Cleavage Planar — strike and dip 8551%
Vein / dike Planar — strike and dip 663<1%
Slickenline Linear — trend and plunge 23<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
Washington Geol. Survey 66,36086%
NGMDB legacy quads 9,14612%
NPS GRI parks 1,4892%
USGS data releases · MRDS 398<1%
Idaho Geol. Survey 108<1%
Oregon DOGAMI (OGDC-8) 10<1%
USGS NGMDB GeMS 7<1%

Most-measured published maps

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

Published mapYearScaleMeasurements
WA 1:100,000 surface geology (GeMS), Orientation— 1:100,00028,598
Database for the geologic map of the Chelan 30-minute by 60-minute quadrangle, Washington [supplement to USGS, Misc. Investigations Series, I-1661]2006 1:100,0002,073
Database for the geologic map of the Snoqualmie Pass 30-minute by 60-minute quadrangle, Washington (I-2538)2006 1:100,0001,729
OFR 80-983— 1:24,0001,457
Preliminary geologic map of the eastern Willapa Hills, Cowlitz, Lewis, and Wahkiakum Counties, Washington2014 1:50,0001,421
OFR 97-2— 1:24,0001,415
OFR 99-3— 1:24,0001,339
OFR 81-581— 1:24,0001,297
Geologic map of the Wenatchee 1:100,000 quadrangle, central Washington: a digital database2005 1:100,0001,191
MF 137— 1:24,0001,162
Geologic map of the Skykomish River 30- by 60-minute quadrangle, Washington1993 1:100,0001,108
MF-237— 1:24,0001,035
GM 46— 1:24,000938
PP 489— 1:24,000902
OFR 98-5— 1:24,000810

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 Washington.

Map unitAgeLithologyMeasurements
Mylonite gneiss; Kettle gneiss dome TMzmg Mesozoic—1,353
Volcaniclastic rocks Ttv Tertiary—1,163
Darrington Phyllite (<10 percent semischist) of the Metamorphic Rocks of the Shuksan nappe of Tabor and others (1994) Jph(d) Mesozoic—842
Ohanapecosh Formation Ovc(oh) Oligocene—728
Swauk Formation Ec(1s) Eocene—694
OEm Oligocene-Eocene—650
Chumstick Formation Ec(2ch) Eocene—618
Quartzite; Kettle gneiss dome TMzq Mesozoic—540
Shuksan Greenschist Jsh(s) Jurassic—501
Crescent Formation Ev(c) Eocene, lower to middle—496
Darrington Phyllite Jph(d) Jurassic—493
Volcaniclastic sedimentary rocks Tvs Tertiary—482

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