Volcanic Springs

Geysers, Hot Springs,
Mud Pots, and Fumaroles

Upper Geyser Basin, Punch Bowl Spring Group

Punch Bowl Spring Group lines the trail from Daisy Group to Black Sand Basin. It comprises only a few thermal features. Punch Bowl Spring itself is a constantly boiling spring and it's not sure, if it was a geyser in the past.

Punch Bowl Spring:

Punch Bowl Spring Yellowstone

Punch Bowl Spring Yellowstone
Immediately right of Punch Bowl Spring another hot spring appears, which has been found to be independent from it.

Spring east of Punch Bowl Spring:

Spring east of Punch Bowl Spring Yellowstone

Punch Bowl Spring Yellowstone
On the other side of Punch Bowl Spring two pools are located, showing weak geyser activity from time to time. The one in the foreground of the picture is listed as UNNG-PBG-1 in T. Scott Bryan's book.

Springs west of Punch Bowl Spring:

UNNG-PBG-1 west of Punch Bowl Spring Yellowstone

UNNG-PBG-1 erupting:

UNNG-PBG-1 west of Punch Bowl Spring Yellowstone

Black Sand Pool a short distance to the west once was the original Black Sand Basin and the only member of it. Here the black obsidian sand is clearly visible and the reason for the name becomes obvious. This pool is capable of powerful eruptions, even if it occurs very rarely.

Black Sand Pool:

Black Sand Pool Yellowstone

Black Sand Pool Yellowstone
In close vicinity and next to the trail Demon's Cave opens up. On rare occasions the spring in the blood-red stained grotto shows eruptions of a few feet height. (Edit 2017: The area around Demon's Cave has been closed by a sign, so you can no longer swing around the crater for a view into the cave.)

Demon's Cave in 2013:

Demon's Cave Yellowstone

Demon's Cave Geyser Yellowstone

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