Structural Measurement Atlas
Atlas / Sources / USGS SIM quads (NE)

USGS SIM quads (NE)

39,217 structural measurements in the Atlas come from USGS SIM quads (NE), harvested across 26 published maps and data releases and reconciled into the Atlas schema.

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56% 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 12,17231%
Foliation Planar — strike and dip 11,57130%
Joint Planar — strike and dip 7,63919%
Lineation (mineral, stretching) Linear — trend and plunge 3,5909%
Cleavage Planar — strike and dip 1,3643%
Fold hinge / axis Linear — trend and plunge 1,3523%
Vein / dike Planar — strike and dip 6172%
Fault plane Planar — strike and dip 372<1%
Bedding Planar — strike and dip 341<1%
Slickenline Linear — trend and plunge 199<1%

Where it is

StateMeasurementsShare
New Hampshire 16,37042%
Vermont 11,97631%
Massachusetts 6,44316%
New York 4,27311%
Rhode Island 155<1%

Most-measured published maps

Published mapYearScaleMeasurements
BF24KNHVTDAS01— 1:24,0006,046
SIM bedrock quadrangle databases, New England— 1:24,0004,740
DASCPNYVT001— 1:24,0004,357
DASWSTNH24K01— 1:24,0003,226
USGS— 1:24,0002,729
SIM bedrock quadrangle databases, New England— 1:24,0002,697
VGS— 1:24,0002,046
DASMAVTNH004— 1:24,0002,008
SIM bedrock quadrangle databases, New England— 1:24,0001,972
SIM bedrock quadrangle databases, New England— 1:24,0001,929
DASSPRVTNH004— 1:24,0001,918
DASMAVTNH065— 1:24,0001,262
DASSPRVTNH005— 1:24,0001,131
SIM bedrock quadrangle databases, New England— 1:24,0001,079
DASSPRVTNH006— 1:24,000524

Most-measured map units

Map unitAgeLithologyMeasurements
Migmatitic biotite gneiss member of the Grenville Complex Ybg MesoproterozoicMetasedimentary rock1,468
Leucogranite gneiss of the Lyon Mountain Granite Gneiss Ylg MesoproterozoicMedium and high-grade regional metamorphic rock, of unspecified origin1,317
Dl ——1,159
Op ——1,092
Schist member of the Littleton Formation Dl Lower DevonianMetasedimentary rock938
Sru ——738
Dbg ——717
Scq ——593
Sulfidic schist member of the Partridge Formation Op OrdovicianMetasedimentary rock593
Dkg ——522
Limestone and schist member of the Waits River Formation DSwl Lower Devonian and Silurian Lower Devonian and SilurianMetasedimentary rock514
Undifferentiated conglomerate and quartzite member of the Clough Quartzite Scq SilurianMetasedimentary rock469

Other sources