PointofInterestRoadSigns.com - Yellowstone National Park - An Exploded Bay 


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Yellowstone National Park - An Exploded Bay


Location of sign - Near the waters edge at the West Thumb section of Yellowstone Lake in Yellowstone National Park


Photo taken May 2008

An Exploded Bay, An Exploded bay road sign, Yellowstone an exploded bay  

Close-up view of sign


An Exploded Bay, An Exploded bay road sign, Yellowstone an exploded bay

Wide view of sign


Text of sign:


An Exploded Bay


West Thumb's shoreline has suspiciously crater-like contours.  It's underwater profile is dramatically deeper than the rest of 

Yellowstone Lake.  Only a massive explosion could have formed West Thumb.


Though the blowout occurred 125,000 years ago, West Thumb is still thermally active.  Hot springs, mudpots, and geysers steam

and percolate along the shore, and temperature gauges record highest heat flow in lake bottom sediments.


This bay is a crater within a crater - a volcanic eruption and a violent collapse within the larger, earlier Yellowstone caldera.


In winter, holes in the thick ice indicate hot spots in the lake bed where thermal features bubble up.  Otters often fish in those 

melt holes.


Graphics on the sign


In addition to the text there is a graphical depiction of the eruption on the lake and a picture of two otters fishing in a melt hole.  

There is also a small map insert showing Yellowstone Lake.


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