Tree fossils are also called wood fossils and silicified wood. It evolved from trees. Around 150 million years ago, trees were buried underground by geological processes (volcanic eruptions or crustal movements). Because they were in a dry environment without water, or because they were cut off from the air and wood was not easy to rot, they were replaced by silica during the long geological process, and the shape of branches was preserved. After several geological changes, the vicissitudes of the sea and the uplift of the land, these buried underground trunks are seen again in the sky. After filling and replacing with minerals, its lignin cells stain the iron and manganese oxides dissolved in water with yellow, red, purple, black and light grey colors, thus becoming today's colorful, gold-inlaid and jadeite-inlaid tree fossils.
Wood fossils also known as silicified wood; chemical formula: SiO nHO, belongs to cryptocrystalline group, hardness: 5.5-6.5, specific gravity: 2.65-2.66, refractive index: 1.54-1.55. It is during the geological history that trees undergo geological changes. Finally, they are buried in the stratum and undergo chemical exchange and filling of groundwater. As a result, these chemicals crystallize and deposit in the woody part of trees, preserving the original structure of trees and forming wood fossils. Silicified wood was mainly formed in the Mesozoic, most of which were in the middle Jurassic and Cretaceous.
Ancient trees were submerged by water containing silica, and the cells in the wood were replaced by quartz chalcedony and opal, so although the appearance of the wood was retained, it was actually 100% of the stone (quartz). Western mystics believe that the original rotten wood, after quartz replacement, has become an immortal gemstone. Therefore, they believe that wood fossils have the energy characteristics of eternity, longevity and immortality. Usually there are many cracks or gaps in wood fossils. In some places, wood fossils have been filled and replaced by other materials such as agate. These are natural products formed over a long period of time, rather than the result of artificial filling. They should not be regarded as defects. On the contrary, this is the magic of wood fossils.
Witnessing the geological changes of hundreds of millions of years, because the wood fiber structure of silicified wood, even the cell structure and trunk shape, bark, rings, wormhole and other characteristics can be preserved, it can not only show its material rich and beautiful, but also its fossil rings, bark, nodules, wormhole, texture and other colorful characteristics record and witness the geological changes and species evolution of millions of years. It provides clues for people to study the history of ancient plants and paleontology, as well as ancient geology and climate change. Its origin has also been built into silicified wood National Park in many countries in the world.