Hydration Rind Dates Rhyolite Flows

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Science  23 Feb 1968:
Vol. 159, Issue 3817, pp. 878-880
DOI: 10.1126/science.159.3817.878


Hydration of obsidian has been used to date rhyolite flows, containing obsidian or porphyritic glass, at Glass Mountain (Medicine Lake Highlands) and Mono Lake, California. The method is simple and rapid and can be used to date flows that erupted between 200 and approximately 200,000 years ago.