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Yellowstone National Park

Hoof And Paw Prints On The Shallow Terraces Of Grand Prismatic Spring, Yellowstone National Park

white paw and hoof prints on the shallow terraces of Grand Prismatic Spring in Yellowstone National Park

If you take a winter snowcoach or snowmobile tour to Midway Basin and walk on the boardwalk around the edges of Grand Prismatic Spring, you'll notice paw and hoof prints on the shallow terraces of the hot spring. That white you see is not snow, but silica. The hot thermal waters hold silica in solution, and when the water cools, the silica precipitates out.

Rebecca Latson

Clepsydra Geyser Seen From Fountain Paint Pot Trail, Yellowstone National Park

A telephoto close-up of an erupting Clepsydra Geyser on a gray winter day along the Fountain Paint Pot Nature Trail in Yellowstone National Park

"This nearly constant performer splashes from several vents and its steam can be seen throughout the Lower Geyser Basin. Its name is Greek for water clock, and was given because the geyser used to erupt regularly every three minutes. Since the 1959 Hebgen earthquake, however, Clepsydra erupts almost without pause."

Rebecca Latson

Bison - And Human - Footprints Around Crested Pool, Yellowstone National Park

A telephoto view of Crested Pool at Upper Geyser Basin, with visible human and bison footprints along the edge of the hot spring in Yellowstone National Park

"With temperatures that average temperate of 191.1°F (88.4°C), Crested Pool is almost constantly boiling, sometimes to 6 feet (2 m) or more. The extreme heat prevents most bacterial growth, resulting in exceptionally clear blue water. Boiling is particularly active along the intricate sinter formation circling the spring, the “crested” edge. Listen for the sizzling. Crested Pool has an average pH of 8.9 and an average conductivity of 2269 uS/cm." 

Rebecca Latson

INN Member

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