Sample 90A
NavDat sample number 3537 · SYENITE
Sample
| Sample ID | 90A |
|---|---|
| Rock name | SYENITE |
| Rock type | PLUTONIC |
| Composition | INTERMEDIATE |
| Material | IGNEOUS |
| Comment | alk syenite vein |
Location
| Latitude | 47.1966 |
|---|---|
| Longitude | -111.797 |
| Location | 1/6 mile W of E boundary of section 25, N side of Missouri River **NOTE: Township and Range coordinates do not agree with location description** |
| State / province | Montana |
| Volcanic field | Adel Mountain Volcanics |
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|---|---|---|---|---|
| 74 | 73 | 76 |