USGS NGMDB GeMS
93,133 structural measurements in the Atlas come from USGS NGMDB GeMS, harvested across 309 published maps and data releases and reconciled into the Atlas schema.
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- 93,133Measurements
- 309Published maps
- 11%Of the Atlas
- 64%Convention stated
64% 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 type | Geometry | Measurements | Share |
|---|---|---|---|
| Bedding | Planar — strike and dip | 34,489 | 37% |
| Foliation | Planar — strike and dip | 30,939 | 33% |
| Joint | Planar — strike and dip | 11,045 | 12% |
| Lineation (mineral, stretching) | Linear — trend and plunge | 5,316 | 6% |
| Other | Planar — strike and dip | 3,534 | 4% |
| Cleavage | Planar — strike and dip | 3,226 | 3% |
| Fold hinge / axis | Linear — trend and plunge | 2,066 | 2% |
| Vein / dike | Planar — strike and dip | 1,208 | 1% |
| Fault plane | Planar — strike and dip | 968 | 1% |
| Slickenline | Linear — trend and plunge | 342 | <1% |
Where it is
| State | Measurements | Share |
|---|---|---|
| Maine | 18,190 | 20% |
| Virginia | 14,013 | 15% |
| Pennsylvania | 12,382 | 13% |
| Colorado | 8,474 | 9% |
| Idaho | 7,289 | 8% |
| Wyoming | 7,187 | 8% |
| Montana | 5,201 | 6% |
| North Carolina | 5,161 | 6% |
| California | 3,482 | 4% |
| Alaska | 3,037 | 3% |
| Maryland | 2,400 | 3% |
| Vermont | 1,431 | 2% |
| Nevada | 1,349 | 1% |
| Utah | 1,217 | 1% |
| Arizona | 1,167 | 1% |
| West Virginia | 806 | <1% |
| Oregon | 195 | <1% |
| Wisconsin | 140 | <1% |
| Washington | 7 | <1% |
| New Hampshire | 1 | <1% |
Most-measured published maps
Most-measured map units
| Map unit | Age | Lithology | Measurements |
|---|---|---|---|
| Metagraywacke and schist of the Ashe Metamorphic Suite CZa | Cambrian to Neoproterozoic | Medium and high-grade regional metamorphic rock, of unspecified origin | 3,482 |
| Felsic gneiss through amphibolite metavolcanics Xgn | Precambrian X | Metamorphic rock | 2,348 |
| Cape Elizabeth Formation of the Casco Bay Group Oce | Ordovician | Schist and gneiss, of sedimentary-rock origin | 2,225 |
| Elbrook Formation Ce | Cambrian | Carbonate rock | 1,816 |
| Metagraywacke and graphitic schist of the Lynchburg Group Zl | Neoproterozoic | Schist and gneiss, of sedimentary-rock origin | 1,514 |
| Bucksport Formation of the Kingsclear Group Sb | Silurian(?) | Schist and gneiss, of sedimentary-rock origin | 1,490 |
| Till Pt | Pleistocene | Glacial till | 1,342 |
| Felsic gneiss to amphibolite metavolcanics Xgn | Precambrian X (Paleoproterozoic) | Meta-felsic and intermediate rock | 1,154 |
| Amphibolite of the Ashe Metamorphic Suite CZaa | Cambrian to Neoproterozoic | Meta-mafic rock | 1,140 |
| Megunticook Formation of the Cookson Group Cm | Cambrian | Schist and gneiss, of sedimentary-rock origin | 1,071 |
| Revett Formation Yr | Mesoproterozoic | Sandstone and mudstone | 1,064 |
| Quartz monzonite Xsl | Precambrian X | Igneous and metamorphic rock | 833 |
Other sources
- NGMDB legacy quads216,089
- NPS GRI parks128,336
- Washington Geol. Survey66,381
- USGS data releases · MRDS47,492
- Alaska DGGS39,281
- USGS SIM quads (NE)39,217
- South Dakota SDGS34,897
- Oregon DOGAMI (OGDC-8)29,982
- Idaho Geol. Survey23,888
- Vermont Geol. Survey19,704
- Virginia DGMR18,661
- Montana MBMG14,434
- Pennsylvania Geol. Survey11,355
- Maine Geol. Survey6,872
- Wyoming WSGS6,824
- Oklahoma Geol. Survey6,506
- Connecticut Geol. Survey5,345
- Wisconsin WGNHS2,871
- Kentucky Geol. Survey2,048
- Maryland Geol. Survey1,481