Old Faithful Virtual Visitor Center

Lobby > Exhibits > Hot Spring Ecology > Microbes > Meet the Microbes > Alkaline Siliceous Springs

Meet the Microbes

ALKALINE SILICEOUS SPRINGS

Many of the hydrothermal features in the Upper, Lower, and Midway geyser basins are alkaline. Colors and textures of the microorganisms are good indicators of temperature changes.

Two people standing on a boardwalk look out at Grand Prismatic Spring
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Environment
Alkaline Siliceous Springs

Two people observe the many colors of Grand Prismatic Spring 		   Acidic Springs

Microbes color the runoff channel from a hot spring in Norris Geyser Basin 		Neutral Sulfide-rich Carbonate Springs
Microbes add bands of color to this formation at Mammoth Hot Springs


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