PointofInterestRoadSigns.com - Yellowstone National Park - Tuff Cliff

 

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Yellowstone National Park - Tuff Cliff

 

Location of sign - roadside in Yellowstone National Park between Madison and Fountain Flat Drive

 

Photo taken June 2008

Tuff Cliff, Tuff Cliff sign, Yellowstone National Park  

Close-up view of sign

 

Tuff Cliff, Tuff Cliff sign, Yellowstone National Park

Wide view of sign

 

Text of sign:

 

Tuff Cliff

 

Dense clouds of volcano ash once flowed across the land.  Rock fragments in the ash were so hot that they welded together and

flattened as they settled.  A series of such ash flows formed the light colored rock, a welded TUFF, exposed in the cliff above.

Water, frost, and roots erode the cliff today.  Severe earthquakes cause sudden rockslides.  The boulders around you are evidence

of the continual erosion of the cliff. 

 

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