← Search
Sample USGSD-M914-2
NavDat sample number 10043 · RHYODACITE
Sample
| Sample ID | USGSD-M914-2 |
|---|
| Rock name | RHYODACITE |
|---|
| Rock type | PLUTONIC |
|---|
| Composition | FELSIC |
|---|
| Material | IGNEOUS |
|---|
| Comment | from same flow as USGSD-M913-1; phenocrysts of plagioclase and quenched augite in groundmass of microlites and glass, a few opaques, and a trachytic texture |
|---|
Location
| Latitude | 45.7467 |
|---|
| Longitude | -112.769 |
|---|
| Location | SE flank of small sharp butte of columnar jointed material, about 20 m below top; Beaverhead County |
|---|
| State / province | Montana |
|---|
| Volcanic field | Pioneer Batholith |
|---|
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 47.6 |
|
45.9 |
49.3 |
|
|
Analyses
No chemical analyses are stored for this sample.
