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Sample USGSD-A
NavDat sample number 6227 · PYROCLASTIC-FALL
Sample
| Sample ID | USGSD-A |
|---|
| Rock name | PYROCLASTIC-FALL |
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| Rock type | VOLCANIC |
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| Composition | FELSIC |
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| Material | IGNEOUS |
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| Comment | fine grained, lavender rhyolitic ash flow with 1-mm phenocrysts of quartz and biotite; K-Ar age suggests the ash may be early extrusive phase of the Mount Sopris igneous center |
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Location
| Latitude | 39.3464 |
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| Longitude | -107.101 |
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| Location | talus slope; Pitkin County |
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| State / province | Colorado |
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| Volcanic field | Mount Sopris igneous center? |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 30.1 |
|
27.1 |
33.1 |
|
|
Analyses
No chemical analyses are stored for this sample.
