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  Black Sand Pool
Feature Type: Geyser
Geyser/Spring Type: Fountain geyser

Upper Geyser Basin
Punch Bowl Spring Group

The name of Black Sand Geyser was given to this feature by the 1871 Hayden Survey, and A. C. Peale, in 1878, continued its use. However, by the late 1880s, the name of “Black Sand Spring” was one people were using.

At the same time, the name “Black Sand Basin” was being used to describe the area including “Black Sand Spring” and the extensive overflow basins (Specimen Lake) below the spring. (The name “Sunlight Basin” was being used for the area of springs along Iron Spring Creek, the main portion of today’s Black Sand Basin). Some confusion developed when the name of “Black Sand Basin,” by at least the late 1800s, was being used also by some for the “Black Sand Spring.” [Whittlesey 1988]

What to look for:
Black Sand Pool has full-blown eruptions only rarely, but it does do other interesting things, some of which might count as "eruptions" according to one's tastes. It frequently produces audible (and even tangible) thumping similar to that felt at Oblong Geyser and a few others. These are easily heard and felt just by standing around the pool for a while. If you feel and hear a particularly energetic string of thumps, keep an eye out for a frothing boil from the pool that may reach a height of 8 feet, an "eruption" by some standards. Rare spouting eruptions were reported in the early days of the park, but none have been observed recently.

Please note - this site is currently under constuction. Please visit for more information.  Last update 01-29-2017

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