Types
Features
Monuments
Famous Monuments
Sculpture
Famous Sculptures
Pictographs
Petroglyphs
Figurines
Fossils
Welded tuff, Rhyolitic tuff, Basaltic tuff, Trachyte tuff and Andesitic tuff.
Always found as volcanic pipes over deep continental crust
Dunite, Wehrlite, Harzburgite, Lherzolite
Constitutes upper part of the Earth's mantle, Generally rough to touch, Is one of the oldest rock