Yellowstone Landscape

Image 73 of 122
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Orange thermophiles and Black Pool  in the West Thumb Geyser Basin in Yellowstone National Park. The pool was cool enough up until 1991 for dark orange-brown cyanobacteria to grow throughout the pool, the pool appeared to be an exceptionally dark green to almost black, hence the misleading name. in 1991 the pool became hot again. Black Pool's temperature became hot enough to kill all the cyanobacteria in the pool, turning the pool a rich teal blue color we enjoy today. The orange thermophiles are a heat loving bacteria that can live around the boiling water of Yellowstone's Thermal features