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The Porcelain Basin Mudpots are volatile hydrothermal features located within the Norris Geyser Basin of Yellowstone National Park in the United States. These mudpots form when sulfuric acid microorganisms decompose surrounding rock into clay, which then mixes with steam and volcanic gases to create...

The Back Basin is a section of Norris Geyser Basin in Yellowstone National Park, Wyoming, containing a diverse array of geothermal features including mudpots, geysers, and hot springs. Norris Geyser Basin is the hottest and most acidic thermal area in Yellowstone. Steamboat Geyser, located in the Ba...

The Porcelain Basin Mudpots are geothermal features located in the Norris Geyser Basin within Yellowstone National Park. Norris is the hottest and most dynamic thermal area in the park. These mudpots form when sulfuric acid microorganisms decompose surrounding rock into sticky, acidic clay, which is...

Emerald Spring resides within Yellowstone National Park’s Norris Geyser Basin. This thermal spring is notable for its vibrant green coloration resulting from thermophilic algae thriving in the warm water. The USGS officially recognized it in 1930 following naming by superintendent Philetus Norris. I...

Echinus Geyser is a notable hydrothermal feature located in the Back Basin area of Yellowstone National Park's Norris Geyser Basin. It is historically recognized as the largest known acidic geyser in the world, with a water pH measuring around 3.5, comparable to vinegar. Historically, it was a frequ...

Ledge Geyser is a hot spring located in the Norris Geyser Basin of Yellowstone National Park, Wyoming. It is distinguished by its angled eruptions, which project water from a series of vents situated along a cliff face rather than vertically. During its active periods, the geyser can eject water up...

Vixen Geyser is a cone-type thermal feature located in the Norris Geyser Basin within Yellowstone National Park, Wyoming. It is characterized by frequent, moderately sized eruptions that can reach heights of approximately 20 to 40 feet. The geyser is known for its highly active and unpredictable int...

Congress Pool is a variable hot spring in Yellowstone's Norris Geyser Basin, named for the Fifth International Geological Congress in 1891.

Porkchop Geyser is a hydrothermal feature in the Norris Geyser Basin of Yellowstone National Park. Once known for intermittent and then nearly continuous eruptions, it underwent a hydrothermal explosion in 1989 when pressure beneath the vent shattered surrounding sinter and scattered rock fragments...

The Nymph Lake Mudpots in Yellowstone National Park, United States, are notable geothermal features recognized for their brightly colored, highly acidic bubbling mud near the lake's edge.

Veteran Geyser is a thermal feature located in the Back Basin area of the Norris Geyser Basin in Yellowstone National Park, Wyoming. Known as a highly variable geyser, its eruptions are infrequent and irregularly timed, often requiring extended dormant periods before activity resumes. When active, i...

Whirligig Geyser is a geyser in Yellowstone's Norris Geyser Basin, Wyoming, USA, named for the spinning, whirling motion visible in the water column during its frequent eruptions.

Black Growler Steam Vent is a fumarole in Yellowstone's Norris Geyser Basin, notable as a named steam vent in the park's hottest basin.

Monarch Geyser Crater is a Norris Geyser Basin feature in Yellowstone, preserving the vent of a former geyser in the park's hottest basin.

A geyser in Yellowstone National Park's Norris Geyser Basin known for historically frequent activity, its name reflecting the persistent or regular nature of its eruptions.

Minute Geyser is a Norris Geyser Basin feature in Yellowstone, named for once-frequent eruptions before thrown debris altered its vent.