Midway Geyser Basin with Grand Prismatic Pool, Yellowstone Park, WY. The steam blowing northeastward by the Firehole River is from the Exelsior Geyser (last active 1890).
Hot water that drains into the Madison River from the Grand Prismatic Spring in the Lower Geyser Basin of Wyoming's Yellowstone National Park has deposited a mound of sinter colored red and yellow by thermophilic bacteria.
Hot water that drains into the Madison River from the Grand Prismatic Spring in the Lower Geyser Basin of Wyoming's Yellowstone National Park has deposited a mound of sinter colored red and yellow by thermophilic bacteria. This is a view of the edge of the sinter.
Hot water that drains into the Madison River from the Grand Prismatic Spring in the Lower Geyser Basin of Wyoming's Yellowstone National Park has deposited a mound of sinter colored red and yellow by thermophilic bacteria.