| Sample identification | ||
|---|---|---|
| Record ID | 2228 | |
| Sample ID | A33125 | |
| Geographic location | ||
| Quadrangle | Petersburg | |
| Latitude | 56.509998 | |
| Longitude | -132.053329 | |
| Processing information | ||
| Dating method | K-Ar | |
| Comment | Rhyolite porphyry, questionable age calculation | |
| Reference | Douglass et al, 1989 | |
| Sample characteristics | ||
| Rock type | porphyry | |
| Mineral dated | muscovite | |
| Analytic result | ||
| Age (my) | 15 | |