The hot water that feeds Mammoth comes from Norris Geyser Basin after traveling underground via a fault line[5] that runs through limestone and roughly parallel to the Norris-to-Mammoth road. The limestone from rock formations along the fault is the source of the calcium carbonate.[6] [7] Shallow circulation along this corridor allows Norris' superheated water to slightly cool before surfacing at Mammoth, generally at about 170 °F (80 °C).  Algae living in the warm pools have tinted the travertine shades of brown, orange, red, and green. 
2015
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