The Terraces at mammoth Hot Springs
Volcanic steam pushes up through the rock to release calcium which forms travertine and the terraces. The process is on going and this scene changes daily. The dark colored stripes are made by "thermophiles" heat loving organisms.
9234Mammoth Hot SpringsMontanaYellowstonegeologic featuresaltssteamtravertinecalciumterraces
From Yellowstone in March