Sample 118p
NavDat sample number 15255 · SYENITE
Sample
| Sample ID | 118p |
|---|---|
| Rock name | SYENITE |
| Rock type | PLUTONIC |
| Composition | INTERMEDIATE |
| Material | IGNEOUS |
| Comment | main syenite; medium to coarsed grained ?; K-feldspar, equidimensional augite, biotite, magnetite, apatite |
Location
| Latitude | 47.47 |
|---|---|
| Longitude | -110.24 |
| Location | Square Butte |
| State / province | Montana |
| Volcanic field | Square Butte laccolith of Central Montana Alkalic Province |
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|---|---|---|---|---|
| 44.5 | 34 | 55 |