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Sample BL-4D
NavDat sample number 8406 · PHONOLITE
Sample
| Sample ID | BL-4D |
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| Rock name | PHONOLITE |
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| Rock type | VOLCANIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | pronounced porphyritic texture and aphanitic groundmass; holocrystalline; phenocrysts of sanidine, aegirine-augite, hauyne, and sphene; trachytic groundmass of orthoclase and smaller amounts of aegirine and magnetite? |
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Location
| Latitude | 44.4447 |
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| Longitude | -104.439 |
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| Location | Bear Lodge Mountains, Houston Creek area |
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| State / province | Wyoming |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 43.9 |
|
36.7 |
51.1 |
|
|
