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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
Close-up
view of sign
Wide
view of sign
Text
of sign:
Solfatara
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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