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Black Pool, West Thumb

Not long ago, Black Pool was truly black. Lower water temperatures allowed thick mats of dark green and brown thermophiles (heat-loving
microorganisms) to grow in the pool, causing it to appear black. The water temperature rose during the summer of 1991, killing these organisms. Black Pool also erupted that summer and several times the following winter. Black Pool is now one of Yellowstone's most beautiful pools.

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Filename
Black Pool, West Thumb Geyser Basin
Copyright
Russ Taylor
Image Size
4016x6016 / 1.2MB
Contained in galleries
Yellowstone Geothermals
Not long ago, Black Pool was truly black. Lower water temperatures allowed thick mats of dark green and brown thermophiles (heat-loving<br /> microorganisms) to grow in the pool, causing it to appear black. The water temperature rose during the summer of 1991, killing these organisms. Black Pool also erupted that summer and several times the following winter. Black Pool is now one of Yellowstone's most beautiful pools.