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Sample 82-504
NavDat sample number 36173 · RHYOLITE
Sample
| Sample ID | 82-504 |
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| Rock name | RHYOLITE |
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| Rock type | VOLCANIC |
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| Composition | FELSIC |
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| Material | IGNEOUS |
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| Comment | scattered phenocrysts of K-feldspar and quartz along with rare hornblende and magnetite in glassy matrix which is partly devitrified; flow banding present; the rhyolite forms a tabular to dome-shaped mass on Archean gneiss and at base of basaltic-andesitic lava flow sequence of the Challis Volcanic Group in the NW part of Medicine Lodge basin |
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Location
| Latitude | 44.9539 |
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| Longitude | -113.254 |
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| State / province | Montana |
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| Volcanic field | Challis Volcanic Group |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 48.69 |
|
48.51 |
48.87 |
|
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Analyses
No chemical analyses are stored for this sample.
