Volcanic Springs

Geysers, Hot Springs,
Mud Pots, and Fumaroles

Upper Geyser Basin, Cascade Group

On the way from Morning Glory Pool to Biscuit Basin you hike through the Cascade Group. The first and most important geyser along the trail is Artemisia Geyser. It got its name from the appearance of the widespread geyserite lining, whose color resembles the grayish-green of the sagebrush Artemisia tridentata. Artemisia's interval ranges between 9 and 34 hours. Eruptions last up to half an hour and reach 9 m (30 feet) height in maximum.

Artemisia Geyser erupting and quiet (roll mouse over picture):

Artemisia Geyser Yellowstone

Artemisia Geyser
Beyond Artemisia the two small cones of Atomizer Geyser can be spotted. Its play is quite complex. Some hours after an overflow three to five minor eruptions occur about one hour apart, reaching up to 9 m (30 feet) height. 15 min to one hour after the last minor, the major eruption starts from the west cone, jetting a fine spray of water through a narrow aperture up to 15 m (50 feet) and lasting approximately 10 minutes. Meanwhile the smaller east cone does only emit steam. The interval between major eruptions is typically near 15 hours.

Atomizer Geyser, east cone in front, west cone in background:

Atomizer Geyser Yellowstone

Atomizer Geyser Yellowstone

Atomizer Geyser starting:

Atomizer Geyser Yellowstone

Atomizer Geyser Yellowstone

Atomizer Geyser in eruption:

Atomizer Geyser Yellowstone

Atomizer Geyser Yellowstone
Upslope of Artemisia Geyser the trail gives access to the rusty orange Iron Spring and its quite similar neighbor. (Edit 2017: the path to Iron Spring has been closed to public access)

Iron Spring:

Iron Spring Yellowstone

Iron Spring Yellowstone

Spring next to Iron Spring:

Spring next to Iron Spring Yellowstone

150 m (165 yards) farther north the next cluster of springs around Gem Pool appears. Gem Pool itself is a deep blue, gorgeous spring, which is very well named.

Gem Pool:

Gem Pool Yellowstone

Gem Pool Yellowstone
The quiet Pinto Spring in direct vicinity discharges into Gem Pool.

Pinto Spring:

Pinto Spring Yellowstone

Pinto Spring Yellowstone
Sprite Pool, a few feet to the north, is an intermittent spring, showing weak splashing occasionally.

Sprite Pool:

Sprite Pool Yellowstone

Sprite Pool Yellowstone

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