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Photographer’s Note

The Black Sand Basin was another favorite of mine as we made our way through Yellowstone National Park last October. The weather was questionable but as you see here, the skies turned sunny and the day was bright. I loved the colors here and yes, this is exactly as my camera recorded the moment, quite stunning if I may say so myself. I tried to get a perspective without the foreground dark shadow, but traversing off the designated paths is not recommended, so I settled for this one. Hope you like it.

Black Sand Basin, an isolated group of the Upper Geyser Basin, was originally named the Emerald Group by A.C. Peale in 1878. But turn of the century tourists began calling it Black Sand Basin because of the small fragments of black obsidian sand which cover portions of the basin.

Black Sand Basin contains a small collection of jewel-like geysers, and colorful hot springs. Emerald Pool is the most colorful and famous of these springs. It is a deep emerald green fringed by an outer ring of yellow and orange. Another colorful pool is Opalescent Pool. This recently formed pool inundated a stand of lodgepole pine, creating a stand of white skeletons amidst a rainbow-colored pool. An unusual geyser formed on the bank of Iron Creek. Cliff Geyser formed a rim or wall-like ridge of sinter around its crater from which it erupts 30 to 40 feet high.

OPALESCENT POOL
Temperature 144°F Dimensions 28x55 feet. Depth 6 feet. Opalescent pool has a cooler temperature than other thermal features at Black Sand Basin. Early in its history Opalescent was a boiling spring, surrounded by smaller springs. In the early 1950s it was a small dry pool, then the run-off from Spouter Geyser flowed into it. The increased water flow flooded the surrounding area, killing the lodgepole pine. Since then silica has precipitated upon the dead tree trunks creating the white "bobby sock" trees. This silica, a non-crystalline compound, slowly impregnates the wood and over time, with the absence of oxygen, could eventually petrify the wood.

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Additional Photos by Gerald Neufeld (gneufeld) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1693 W: 98 N: 3541] (15289)
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