Sample 194B
NavDat sample number 2705 · PHONOLITE
Sample
| Sample ID | 194B |
|---|---|
| Rock name | PHONOLITE |
| Rock type | VOLCANIC |
| Composition | INTERMEDIATE |
| Material | IGNEOUS |
| Comment | distinct dark green groundmass of alkali feldspar microlites and aegirine; phenocrysts of alkali feldspar, plagioclase, nepheline |
Location
| Latitude | 44.3304 |
|---|---|
| Longitude | -103.877 |
| Location | Annie Creek |
| State / province | South Dakota |
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|---|---|---|---|---|
| 49 | 39 | 60 |