PointofInterestRoadSigns.com - Yellowstone National Park - Solfatara


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 Welcome to Point of Interest Road Signs! A collection of photos of road and trail signs.  Click here for more Wyoming Signs


Yellowstone National Park - Solfatara


Location of sign - the Norris Geyser Basin trail in Yellowstone National Park


Photo taken June 2008

Solfatara, Solfatara sign, Norris Geyser Basin Yellowstone National Park  

Close-up view of sign


Solfatara, Solfatara sign, Norris Geyser Basin Yellowstone National Park

Wide view of sign


Text of sign:




Unstable Ground


This hillside is venting.  As sulfuric acid, gases, and steam escape, they create a barren and very dangerous landscape called 

solfatara: scalding mud and steam are often barely covered by hot crumbling decomposed rock.  Unlike other geothermal features,

this solfatara's high concentration of sulfuric acid breaks down the surrounding rock making a confined "plumbing system" unlikely-

the gases and steam escape less dramatically.


Sometimes a solfatara has larger, well-defined vents like those at Roaring Mountain (just North of Norris Junction).


Graphics on the sign


In addition to the text there is a picture of the solfatara at Roaring Mountain.


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