Mammoth Hot Springs is a very active geothermal region in the northwestern part of Yellowstone Park.

 

Mineral-rich hot springs have over many years deposited thick layers of colored travertine on the Mammoth Terraces.

Terrace Mountain is the world's largests calcium carbonate depositing hot spring.

 

Norris Geyser Basin is the source of the hot springs, the water travels through a limestone-rich underground fault.

 

At Mammoth temperatures have dropped enough to allow algue growth in the pools that gives the travertine its special colors.

 

A network of boardwalks lets you walk     

upclose to the terraces and pools.

 

We were at the Mammoth Hot Springs in June 1990