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A tourist visiting all the prominent geyser basins, hot springs, Yellowstone Lake, and the Grand Canyon and Falls of the Yellowstone, is not likely to come upon any other rock than rhyolite, excepting, of course, deposits from the hot springs, unless he ascends Mount Washburn.

— Arnold Hague

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Quote text and notes from Wikiquote: Arnold Hague (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.