Types
Sedimentary rock
Welded tuff, Rhyolitic tuff, Basaltic tuff, Trachyte tuff, Andesitic tuff and Ignimbrite.
Features
Generally rough to touch, Splintery, Veined
Always found as volcanic pipes over deep continental crust
Archaeological Significance
Monuments
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Famous Monuments
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Easter Island in the Polynesian Triangle, Pacific Ocean
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
Present
Absent