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Mammoth Hot Springs

  • Mammoth Hot Springs
  • Grand Prismatic
  • Morning Glory Pool
  • Handkerchief Pool
  • Hot Spring Colors
  • The bedrock underlying the Mammoth area is limestone, deposited here millions of years ago by a vast inland sea. Hot water with dissolved carbon dioxide makes a weak carbonic acid. As the solution rises through underground channels, it dissolves calcium carbonate, the primary ingredient of limestone. At the surface, the calcium carbonate is deposited in the form of travertine, the mineral that forms the terraces of Mammoth Hot Springs.

    water drips from icicle like formations of travertine

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    This work is supported by

    National Science Foundation    Yellowstone Park Foundation

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