Sample GAD-7
NavDat sample number 12136 · RHYOLITE
Sample
| Sample ID | GAD-7 |
|---|---|
| Rock name | RHYOLITE |
| Rock type | VOLCANIC |
| Composition | FELSIC |
| Material | IGNEOUS |
| Comment | Light gray, weathered white, moderately microvitrophyric with euhedral phenocrysts of sanidine, sodic plagioclase, and biotite in hyalopilitic groundmass |
Location
| Latitude | 40.6867 |
|---|---|
| Longitude | -120.88 |
| State / province | California |
| Volcanic field | Walker Lane |
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|---|---|---|---|---|
| 3.8 | 3.5 | 4.1 |