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Sample BL-250
NavDat sample number 8357 · TRACHYTE
Sample
| Sample ID | BL-250 |
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| Rock name | TRACHYTE |
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| Rock type | PLUTONIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | holocrystalline, porphyritic; sanidine phenocrysts in aphanitic, trachytic groundmass; no plagioclase; rock is pervasively fractured and altered; all original mafic minerals have been altered to products such as limonite, hematite, clay, calcite, analcime, and K-feldspar |
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Location
| Latitude | 44.4846 |
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| Longitude | -104.455 |
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| Location | Warren Peaks area of Bear Lodge Mountains |
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| State / province | Wyoming |
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| Volcanic field | Bear Lodge intrusive complex |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 50.5 |
|
49.3 |
51.7 |
|
|
