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Sample 87
NavDat sample number 11353 · TRACHYTE
Sample
| Sample ID | 87 |
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| Rock name | TRACHYTE |
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| Rock type | VOLCANIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | porphyritic; phenocrysts form flow foliation; holocrystalline matrix of anorthoclase-Na sanidine, clinopyroxene, and magnetite; phenocrysts are feldspar, amphibole, pyroxene, magnetite-ulvospinel, and minor biotite |
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Location
| Latitude | 42.7272 |
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| Longitude | -107.328 |
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| Location | Rattlesnake Hills |
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| State / province | Wyoming |
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| Volcanic field | alkali trachyte |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 43.6 |
|
41.4 |
46.6 |
|
|
