2022—Storm Clouds Over the Travertine Terraces

The terraces at Mammoth Hot Springs in Yellowstone National Park are created as water rises through limestone carrying dissolved calcium carbonate that forms chalky white travertine. The soft rock changes constantly and bacteria and algae color the chalky white rock in vivid oranges and greens and yellows. As Friday’s storm clouds gathered overhead, the steam vents on the Lower Terrace became more visible against the darkening mountains in the distance.