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Sample USGSD-507-2
NavDat sample number 7974 · TRACHYANDESITE
Sample
| Sample ID | USGSD-507-2 |
|---|
| Rock name | TRACHYANDESITE |
|---|
| Rock type | VOLCANIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | plagioclase, augite, hypersthene, opaques, biotites, microlites, and possibly some glass |
|---|
Location
| Latitude | 45.6014 |
|---|
| Longitude | -112.821 |
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| Location | from large rock ledge on steep slope; coeval with other dated andesites; Beaverhead County |
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| State / province | Montana |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 47.9 |
|
46.3 |
49.5 |
|
|
Analyses
No chemical analyses are stored for this sample.
