← Search
Sample 40
NavDat sample number 11328 · DACITE
Sample
| Sample ID | 40 |
|---|
| Rock name | DACITE |
|---|
| Rock type | VOLCANIC |
|---|
| Composition | FELSIC |
|---|
| Material | IGNEOUS |
|---|
| Comment | coarsely porphyritic; matrix is holocrystralline and uniform in grain size, composed of plagioclase, alkali feldspar, quartz; quartz-lined and -filled vesicles present; phenocrysts of plagioclase, amphibole, corroded alkali feldspar, and minor magnetite, biotite, and quartz |
|---|
Location
| Latitude | 42.7564 |
|---|
| Longitude | -107.223 |
|---|
| Location | Rattlesnake Hills |
|---|
| State / province | Wyoming |
|---|
| Volcanic field | NE dacite group |
|---|
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 43.6 |
|
41.4 |
46.6 |
|
|
