There is water in Mammoth right now. I hear that sometimes there isn't. I've had a few people tell me about it. The colors of the rocks come from bacteria and other organisms that live in the different temperatures of water. They vary in color according to the temperature. Fascinating.
Apparently this is how travertine forms. I suddenly feel guilty that my bathrooms and laundry room have travertine tile - but boy is it gorgeous all polished and flat on my walls and floors.
Cool dead tree and its shadow.
My favorite spot - every time we visit Yellowstone. So colorful and the storm clouds just added to it.
And this is Emerald Pool. Very pretty and perfectly named.