Obsidian agglomerate - top of later Quaternary rhyolite flow. Yellowstone National Park, Gallatin County, Montana. 1959.
Dates
Date Taken
1959
Summary
Index card: Obsidian agglomerate - top of later Quaternary rhyolite flow. Black Canyon Road southwest of West Yellowstone. Gallatin County, Montana. September 1959.
Summary
Index card: Obsidian agglomerate - top of later Quaternary rhyolite flow. Black Canyon Road southwest of West Yellowstone. Gallatin County, Montana. September 1959.
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Available in the U.S. Geological Survey, Denver Library Photographic Collection, Hamilton, W.B. Collection.
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