Travel Reference
In-Depth Information
In the backcountry less than a mile from here, microbiologists have found a very hot
pool with a diversity of life forms hitherto unimagined. In Yellowstone, scientists continue
to learn about some of the oldest forms of life on earth.
Dragon's Mouth Spring
Dragon's Mouth Spring*
is still fun to visit, although its activity has diminished in recent
years. The belching waters from deep within its cavern make an amazing thumping sound.
You may be mesmerized by the sound and the repetition of the surging action.
Continuing on the Grand Loop Road
5.9/9.5
Sulphur Caldron parking area. A hot spot burst through the pavement here in
about 1980, requiring a protective fence.
Sulphur Caldron
is below the level of the road. You'll see more than one large pool and
smaller bubbling or steaming ones. Sulphur Caldron is sometimes nearly dry; to its left is
green
Turbulent Pool.
Sulfur and microorganisms that live on sulfur contribute to the yellow-
green color. Acidic gases rotted the supporting wall; a new one was built in 1985.
