Structural Measurement Atlas
Atlas / Sources / Washington Geol. Survey

Washington Geol. Survey

66,381 structural measurements in the Atlas come from Washington Geol. Survey, harvested across 186 published maps and data releases and reconciled into the Atlas schema.

Show only this source on the map

53% 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
Bedding Planar — strike and dip 35,34953%
Foliation Planar — strike and dip 18,90128%
Lineation (mineral, stretching) Linear — trend and plunge 4,3497%
Fault plane Planar — strike and dip 2,8014%
Joint Planar — strike and dip 2,1653%
Fold hinge / axis Linear — trend and plunge 1,3092%
Cleavage Planar — strike and dip 8391%
Other Planar — strike and dip 393<1%
Vein / dike Planar — strike and dip 275<1%

Where it is

StateMeasurementsShare
Washington 66,360100%
Oregon 14<1%
Idaho 6<1%

Most-measured published maps

Published mapYearScaleMeasurements
WA 1:100,000 surface geology (GeMS), Orientation— 1:100,00028,603
OFR 80-983— 1:24,0001,457
OFR 97-2— 1:24,0001,415
OFR 99-3— 1:24,0001,339
OFR 81-581— 1:24,0001,297
MF 137— 1:24,0001,162
MF-237— 1:24,0001,035
GM 46— 1:24,000938
PP 489— 1:24,000902
OFR 98-5— 1:24,000810
OFR 87-17— 1:24,000792
B-1679— 1:24,000788
OFR 89-141— 1:24,000781
Rhodes M.S.— 1:24,000777
MS-2023-062023 1:24,000761

Most-measured map units

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

Other sources