Yellowstone NP Wild | Mammoth Hot Springs This Mammoth Hot Springs image was captured during a rain shower. Mammoth Hot Springs, in the northwestern part of Yellowstone NP, is a large complex of hot springs on a mound of travertine, a form of limestone, created over thousands of years as hot water from the spring cooled and deposited calcium carbonate. The spring’s energy comes from the same magmatic system that fuels other Yellowstone geothermal areas. The hot water that feeds Mammoth comes from Norris Geyser Basin after traveling underground via a fault line. The water temperature at the spring hovers at about 170 °F (80 °C). Algae living in the warm pools have tinted the travertine shades of brown, orange, red, and green. For the whole story with all images, see Yellowstone NP Wild | a 7 Image Story.
