Reference 1982
Sanford, Richard F; Snee, Lawrence W (2005) U. S. Geological Survey Bulletin, Report: B 2064-II, 22 pp., May 2005
| Authors | Sanford, Richard F; Snee, Lawrence W |
|---|---|
| Year | 2005 |
| Source | U. S. Geological Survey Bulletin, Report: B 2064-II, 22 pp., May 2005 |
| ISSN | 8755-531X |
| GeoRef | 2005-046755 |
| Keywords | breccia; Cenozoic; Challis Volcanics; Eocene; Idaho; igneous rocks;lava flows; lithostratigraphy; Little Wood River valley; Paleogene;pyroclastics; south-central Idaho; Tertiary; tuff; United States;USGS; volcanic rocks; volcaniclastics |
| Notes | Accessed on July 6, 2005; includes appendix |
Abstract
The Challis volcanic field is the largest of several Eocene volcanicfields in the Pacific Northwest of the United States and Canada. Inthe Little Wood River area of Idaho, rock types in the Eocene ChallisVolcanic Group include andesite lava flows and tuff breccia, dacitelava flows and flow breccia, volcaniclastic sedimentary rocks, lithictuff, nonvolcanic conglomerate, and rhyolite dikes.
28 samples from this reference
| Sample | Rock name | Major | Trace | Isotope |
|---|---|---|---|---|
| 7H10A | Basaltic-andesite | yes | ||
| 7H13 | Basaltic-andesite | yes | ||
| 7H18 | Basaltic-andesite | yes | ||
| 7H20 | Basaltic-andesite | yes | ||
| 7H22A | Basaltic-andesite | yes | ||
| 7H59 | Shoshonite | yes | ||
| 7H22B | Andesite | yes | ||
| 7H64 | Andesite | yes | ||
| 7H49 | Basalt | yes | ||
| 7H58 | Basalt | yes | ||
| 7H87A | Basalt | yes | ||
| 7H35 | Dacite | yes | ||
| 7H109 | Dacite | yes | ||
| 7H110 | Dacite | yes | ||
| 7H21 | Trachyte | yes | ||
| 7H22D | Trachyte | yes | ||
| 7H69 | Trachyte | yes | ||
| 7H34 | Rhyolite | yes | ||
| 7H31A | Rhyodacite | yes | ||
| 7H31B | Rhyolite | yes | ||
| 7H33 | yes | |||
| 7H126 | yes | |||
| 8H121 | Rhyolite | |||
| 8H105 | Dacite | |||
| 8H106 | Dacite | |||
| 8H141 | Pyroclastic-fall | |||
| 8H138 | Dacite | |||
| 8H140 | Andesite |