California strike and dip data
97,406 structural measurements in California, digitized from 3,181 published geologic maps across 5 sources. Every row carries its azimuth, inclination, measurement type, location confidence and the citation of the map it came from.
- 97,406Measurements
- 3,181Published maps
- 46,681Bedding
- 5Sources
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 California holds:
| Measurement type | Geometry | Measurements | Share |
|---|---|---|---|
| Bedding | Planar — strike and dip | 46,681 | 48% |
| Foliation | Planar — strike and dip | 31,922 | 33% |
| Other | Planar — strike and dip | 6,869 | 7% |
| Vein / dike | Planar — strike and dip | 3,685 | 4% |
| Lineation (mineral, stretching) | Linear — trend and plunge | 2,436 | 3% |
| Fault plane | Planar — strike and dip | 2,142 | 2% |
| Cleavage | Planar — strike and dip | 1,966 | 2% |
| Joint | Planar — strike and dip | 996 | 1% |
| Slickenline | Linear — trend and plunge | 541 | <1% |
| Fold hinge / axis | Linear — trend and plunge | 168 | <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.
| Source | Measurements | Share |
|---|---|---|
| NGMDB legacy quads | 60,290 | 62% |
| NPS GRI parks | 29,656 | 30% |
| USGS data releases · MRDS | 3,973 | 4% |
| USGS NGMDB GeMS | 3,482 | 4% |
| Oregon DOGAMI (OGDC-8) | 5 | <1% |
Most-measured published maps
The individual quadrangles and data releases contributing the most measurements in California. The full
citation for every map behind a selection ships in the sources.csv of any export.
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 California.
| Map unit | Age | Lithology | Measurements |
|---|---|---|---|
| Lower part of the Great Valley sequence KJgvl | Late Jurassic to Early Cretaceous | Marine sediment, mostly fine-grained | 407 |
| Lithic graywacke fs2 | Upper Jurassic and Cretaceous | Metasedimentary rock | 358 |
| Phyllite-greenschist belt, Phyllite, with quartzite and metachert TrCp | Triassic to Carboniferous | Metasedimentary rock | 211 |
| Altered basaltic rocks (greenstone) fg | Upper Jurassic and Cretaceous | Meta-mafic rock | 141 |
| Tev | — | — | 135 |
| Chert and minor interbedded siliceous shale and tuff fc | Upper Jurassic and Cretaceous | Chert | 129 |
| Devil?s Gate amphibolite, Amphibolite and hornblende gneiss Pam | Permian | Metaigneous rock | 126 |
| Lang-Halsted Sequence, Undivided DOsfl | Devonian? to Ordovician? | Metasedimentary rock | 112 |
| Graywacke of Little Sulphur Creek (structural unit 1) fs1 | Upper Jurassic and Cretaceous | Metasedimentary rock | 103 |
| Phyllite-greenschist belt, Metachert with minor phyllite TrCc | Triassic to Carboniferous | Metasedimentary rock | 98 |
| Clipper Gap Formation, Phyllite and metachert JTrc | Early Jurassic and Triassic | Metasedimentary rock | 88 |
| Locally conglomeratic metagraywacke fms | Upper Jurassic and Cretaceous | Medium and high-grade regional metamorphic rock, of unspecified origin | 86 |
Other states
- Washington71,801
- Colorado52,728
- Montana48,678
- Alaska48,016
- Idaho44,711
- Virginia42,037
- Oregon40,354
- South Dakota37,339
- Vermont34,205
- Arizona30,474
- Pennsylvania29,970
- Maine26,897
- New Hampshire26,822
- North Carolina18,758
- Wyoming17,904
- Nevada12,581
- Connecticut11,563
- Utah9,589
- Wisconsin8,802
- Massachusetts8,162
- New Jersey7,797
- New York7,202
- Maryland7,019
- Oklahoma6,682
- All states →