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Sample BL-40B
NavDat sample number 8434 · FELSITE
Sample
| Sample ID | BL-40B |
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| Rock name | FELSITE |
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| Rock type | PLUTONIC |
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| Composition | FELSIC |
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| Material | IGNEOUS |
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| Comment | porphyritic with aphanitic groundmass; groundmass varies from strongly trachytic to pilotaxitic, composed of primary alkali feldspar, plagioclase, feldspathoid, pyroxene, sphene; secondary muscovite, clay, orthoclase, calcite, zeolites, quartz, oxides; phenocrysts of alkali feldspar, plagioclase ? |
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Location
| Latitude | 44.4494 |
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| Longitude | -104.451 |
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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 |
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| 43.9 |
|
36.7 |
51.1 |
|
|
