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Sample USGSDG-A-82
NavDat sample number 19132 · RHYOLITE
Sample
| Sample ID | USGSDG-A-82 |
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| Rock name | RHYOLITE |
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| Rock type | VOLCANIC |
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| Composition | FELSIC |
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| Material | IGNEOUS |
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| Collected by | D.C. Hedlund |
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| Comment | dike consisting of high-temperature albite phenocrysts fine-grained in aphanitic groundmass; no mafic minerals |
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Location
| Latitude | 39.0639 |
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| Longitude | -106.255 |
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| Location | along road on N side of Low Pass Gulch; Lake County |
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| State / province | Colorado |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 65.3 |
|
62.9 |
67.7 |
|
|
Analyses
No chemical analyses are stored for this sample.
References
- Marvin, Richard F; Mehnert, Harald H; Naeser, Charles W; Zartman,Robert E (1989) U. S. Geological Survey radiometric ages; Compilation C; Part five;Colorado, Montana, Utah, and Wyoming. Isochron/West, vol.53, pp.14-19, Jun 1989
