Structural Measurement Atlas
Atlas / States / Oregon

Oregon strike and dip data

40,787 structural measurements in Oregon, digitized from 1,010 published geologic maps across 6 sources. Every row carries its azimuth, inclination, measurement type, location confidence and the citation of the map it came from.

Open Oregon 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 Oregon holds:

Measurement typeGeometryMeasurementsShare
Bedding Planar — strike and dip 36,92791%
Foliation Planar — strike and dip 1,3193%
Vein / dike Planar — strike and dip 7422%
Lineation (mineral, stretching) Linear — trend and plunge 5861%
Cleavage Planar — strike and dip 4901%
Other Planar — strike and dip 4341%
Joint Planar — strike and dip 154<1%
Fault plane Planar — strike and dip 119<1%
Slickenline Linear — trend and plunge 11<1%
Fold hinge / axis Linear — trend and plunge 5<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
Oregon DOGAMI (OGDC-8) 29,94073%
NGMDB legacy quads 9,30723%
USGS data releases · MRDS 8402%
NPS GRI parks 4911%
USGS NGMDB GeMS 195<1%
Washington Geol. Survey 14<1%

Most-measured published maps

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

Published mapYearScaleMeasurements
Geologic map and database of the Roseburg 30' X 60' quadrangle, Douglas and Coos Counties, Oregon2000 1:100,0003,981
WellRE20202020 —2,848
Geologic map of the Tillamook Highlands, northwest Oregon Coast Range: a digital database1995 1:62,5002,844
DickWR1965easthalf1965 —1,565
DickWR1965westhalf1965 —1,165
SnavPD1976b1976 —1,163
SnavPD1976a1976 —1,034
MadiIPUnpub— —1,017
SnavPD1976c1976 —1,012
WileTJ20112011 —917
McClJD20132013 —882
NiemAR19851985 —783
BrowCE1966a1966 —762
Geologic map of the Poison Creek and Burns 7.5’ quadrangles, Harney County, Oregon2019 1:24,000612
EvanJG19931993 —604

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 Oregon.

Map unitAgeLithologyMeasurements
Tuff of Durkee Valley Tt MiocenePyroclastic flows2,823
Begg Formation TRbg TriassicClastic sedimentary rock776
Grande Ronde Basalt, upper flows, normal magnetic polarity Tgn2 MioceneMafic-composition lava flows739
Slate, argillite, metachert, and conglomerate TRbs Paleozoic/MesozoicMetasedimentary rock732
Brisbois Formation TRbr TriassicMostly mudstone690
Fields Creek Formation TRf TriassicMostly mudstone612
Tmtr ——497
Alluvium Qal QuaternaryClastic sediment479
Elkhorn Ridge Argillite TRPer Paleozoic/MesozoicMostly mudstone438
Siletz River volcanic series Tsr Paleocene/EoceneMafic-composition lava flows357
Sandstone and siltstone Ts Miocene----Volcaniclastic (fragmental) material346
Coaledo Formation, lower member Tecl EoceneSandstone305

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