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Sample 38
NavDat sample number 5617 · RHYOLITE
Sample
| Sample ID | 38 |
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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 | coursely porphyritic with phenocrysts of oligoclase, hornblende, quartz, sanidine, accessory sphene, magnetite, biotite, and zircon; holocrystalline groundmass of microlites of K-feldspar, magnetite, hornblende, quartz, and apatite |
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Location
| Latitude | 42.7115 |
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| Longitude | -107.403 |
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| Location | Boomerang |
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| State / province | Wyoming |
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| Volcanic field | Rattlesnake Hills |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 45.1 |
|
42.5 |
47.7 |
|
|
