Sample 175A
NavDat sample number 2704 · PHONOLITE
Sample
| Sample ID | 175A |
|---|---|
| Rock name | PHONOLITE |
| Rock type | VOLCANIC |
| Composition | INTERMEDIATE |
| Material | IGNEOUS |
| Comment | phenocrysts of feldspar, pyroxene; very fine phaneritic to microcrystalline groundmass of alkali feldspar, aegirine, aegirine-augite, sodalite, nepheline |
Location
| Latitude | 44.4162 |
|---|---|
| Longitude | -103.807 |
| Location | Tetro Rock |
| State / province | South Dakota |
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|---|---|---|---|---|
| 49 | 39 | 60 |