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Sample WC69-3
NavDat sample number 48645 · TRACHYBASALT
Sample
| Sample ID | WC69-3 |
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| Rock name | TRACHYBASALT |
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| Rock type | VOLCANIC |
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| Composition | MAFIC |
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| Material | IGNEOUS |
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| Comment | porphyritic with large phenos of augite in groundmass of labradorite, sanidine, augite, biotite, hornblende, quartz, magnetite, and apatite; sample is from a large angular block of trachybasalt in a thick layer of coarse volcanic breccia in lower part of the Adel Mountain Volcanics |
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Location
| Latitude | 47.1306 |
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| Longitude | -111.883 |
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| Location | east wall of valley of the Missouri River, 3 to 6 m east of Frontage Road formerly US Hwy 91 |
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| State / province | Montana |
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| Volcanic field | Adel Mountain Volcanics |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 75.7 |
|
75.2 |
76.2 |
|
|
Analyses
No chemical analyses are stored for this sample.
References
- Harlan, Stephen S; Snee, Lawrence W; Reynolds, Mitchell W; Mehnert,Harald H; Schmidt, R G; Sheriff, Steve D; Irving, Anthony J (2005) U. S. Geological Survey Professional Paper, Report: P 1696, 29 pp.,2005
