Types
Welded tuff, Rhyolitic tuff, Basaltic tuff, Trachyte tuff, Andesitic tuff and Ignimbrite.
Intermediate volcanic rock
Features
Always found as volcanic pipes over deep continental crust
Generally rough to touch, High silica content, Is one of the oldest rock
Archaeological Significance
Monuments
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Famous Monuments
Easter Island in the Polynesian Triangle, Pacific Ocean
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Sculpture
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Famous Sculptures
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Pictographs
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Petroglyphs
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Figurines
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Fossils
Absent
Absent