Made of Petrified Wood which is the fossilized remains of trees and is approximately 15 millions years old.   It is the result of a tree being completely transitioned to stone .  All the organic material have been converted to minerals  such as quartz.  Unlike other types of fossils which are typically impressions or compressions, petrified wood is a three-dimensional representation of the original organic material.

48″ L  x  33″  W  x 30″ H