Today’s Yellowstone Photos

These photos were taken between Madison and Mammoth Hot Springs early Friday, August 17th. Click image for larger version.

Frost, Yellowstone
That’s frost — in mid-August. It was 34ºF when this photo was taken.
Roaring Mountain, Yellowstone
That’s neither snow nor frost. It’s rock bleached by the acid sulfate in the steam coming from the fumeroles. Fumeroles are so hot, the water turns to steam on contact. The fumeroles at Roaring Mountain hiss and rumble, though not as much, they say, as they did when it was named in 1885.
Mammoth Hot Springs Terrace, Yellowstone
The terraces at Mammoth Hot Springs were created by calcium carbonate deposited by the water that flows from above.
Mammoth Hot Springs, Yellowstone
Another view of the deposits on the terraces above Mammoth Hot Springs. The hydrothermal activity in this area moves, so vegetation springs up, then is defeated when the chemicals return.

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