Indonesia’s Astounding Petrified Trees

Petrified Wood is made from metamorphosed ancient trees and are a type of natural wood fossils. A prehistoric volcanic episode entombed these huge trees about 25 million years ago. The petrified trees form when minerals, including silica dissolved from volcanic ash, are absorbed into the porous wood over millions of years. The fossil wood then crystallizes within the cellular structure. Over time that crystallized material replaced the organic material and was eventually exposed on the Earth’s surface by erosion.

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