Geology and stratigraphy of the Challis volcanic group and relatedrocks, Little Wood River area, south-central Idaho, with a section ongeochronology 
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GeoREF Number:
2005-046755 (View Original Data File)
Sanford, Richard F; Snee, Lawrence W
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
U. S. Geological Survey Bulletin, Report: B 2064-II, 22 pp., May 2005
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.
Accessed on July 6, 2005; includes appendix
GeoRef, Copyright 2005, American Geological Institute.

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