Sample: 74ALe-21
| Sample ID: | 74ALe-21 [1] |
| Station ID: | 74ALe-21 |
| AT Num: | |
| Volcano: | Drum |
| Possible source: | |
| Eruption: | |
| Collector: | Unknown, Unknown |
| Date sampled: | 1974-00-00 |
| Sample type 1: | Other |
| Color: | |
| Final unit: | |
| Text Description: | Volcanic Avalanche Deposits of Nadina Valley. Semiconsolidated and crudely stratified deposits of unsorted volcanic rock debris resulting from paroxysmal explosive activity within central vent area of Mount Drum stratocone, or possibly from a site associated with the rhyodacite domes of Snider Peak (Qldd). Deposits range from light gray and buff to light shades of pinkish gray, green, and lavender and consist chiefly of fresh-appearing gray to buff blocks, pumice, and ash of hornblende dacite or rhyodacite from stratocone and two domes. Dacite or rhyodacite ejecta, which commonly occur as breadcrusted blocks and contain plagioclase, green hornblende, and minor to rare biotite and hypersthene, probably originated from a complex of central plug domes. Maximum thickness, probably greater than 7 cubic km. North of Nadina Glacier avalanche deposits apparently become intimately mixed with, and overlain by, contemporary and later colluvial and glacial deposits; contact shown here is largely conjectural. |
| Sample Location: |
