← Search
Sample SBC-9
NavDat sample number 15259 · SHONKINITE
Sample
| Sample ID | SBC-9 |
|---|
| Rock name | SHONKINITE |
|---|
| Rock type | VOLCANIC |
|---|
| Composition | MAFIC |
|---|
| Material | IGNEOUS |
|---|
| Comment | chilled zone of shonkinite; medium grained, massive, broadly homogeneous; subequal proportions of augite and K-feldspar sanidine; minor amounts of biotite, olivine, magnetite, and 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 |
|
|
