Canary Springs is part of the main terrace in Mammoth Hot Springs, Yellowstone National Park. It is named for its yellow algae and its deep blue pool.
Photo by Fred Plughoft
This postcard is postmarked in 2014 with a winter cardinal stamp.
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Mammoth Hot Springs is a large complex of hot springs on a hill of travertine in Yellowstone National Park. It was created over thousands of years as hot water from the spring cooled and deposited calcium carbonate (over two tons flow into Mammoth each day in a solution).