Sample: 72-PCL-75
| Sample ID: | 72-PCL-75 [1] | ||||||||||
| Station ID: | 72-PCL-75 | ||||||||||
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| Collector: | Lowe, P. C. | ||||||||||
| Date sampled: | 1972-00-00 | ||||||||||
| Sample type 1: | Lava | ||||||||||
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| Text Description: | Wrangell Lava. Rhyodacite domes and associated flows. Massive, usually gray rocks that weather pinkish gray to tan. Commonly porphyritic, with abundant phenocrysts of plagioclase (as much as 60% of rock), hypersthene, and minor oxyhornblende and altered biotite. Locally devitrified and altered to chlorite and clay minerals. K-Ar date on plagioclase from large dome in northeastern part of quadrangle (sec. 7 , T. 7 N., R. 13 E.) is 3.74 m.y. (M. Lanphere, written commun., 1977) | ||||||||||
| Sample Location: |
  Legend ✕
50 km 30 mi |
