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Sample 42
NavDat sample number 11331 · DACITE
Sample
| Sample ID | 42 |
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| Rock name | DACITE |
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| Rock type | VOLCANIC |
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| Composition | FELSIC |
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| Material | IGNEOUS |
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| Comment | coarsely porphyritic; matrix is holocrystralline and uniform in grain size, composed of plagioclase, alkali feldspar, quartz; quartz-lined and -filled vesicles present; phenocrysts of plagioclase, amphibole, corroded alkali feldspar, and minor magnetite, biotite, and quartz |
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Location
| Latitude | 42.7544 |
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| Longitude | -107.232 |
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| Location | Rattlesnake Hills |
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| State / province | Wyoming |
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| Volcanic field | NE dacite group |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 43.6 |
|
41.4 |
46.6 |
|
|
