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Sample 20
NavDat sample number 11318 · DACITE
Sample
| Sample ID | 20 |
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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 | seriate, porphyritic; fine grained to microcrystalline holocrystalline matrix of plagioclase, quartz, Na sanidine; vesicles common, with flow foliation; phenocrysts of plagioclase, amphibole, and minor alkali feldspar, magnetite, and biotite |
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Location
| Latitude | 42.6975 |
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| Longitude | -107.358 |
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| Location | Rattlesnake Hills |
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| State / province | Wyoming |
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| Volcanic field | SW dacite group |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 43.6 |
|
41.4 |
46.6 |
|
|
