Opalescent Pool (1991)

In the Black Sands Basin of Yellowstone National Park, Wyoming, Opalescent Pool is the runoff from a nearby geyser that began erupting in the 1950s. The water flooded and killed a stand of lodgepole pines, encrusting their “skeletons” with silica precipitated from the water. Black Sands Basin is named for its fragments of obsidian, a black glass formed in explosive volcanic eruptions.

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