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"Petrified wood" or "fossil wood is a stone that originated from trees that have fallen under thick layers of volcanic ash.
Fill the timber cells by minerals
The ash contains many minerals that slowly dissolve into the groundwater. Because the trees are no longer in contact with oxygen rotten wood is not as fast as normal. The groundwater soaked tree in the meantime with minerals where they are deposited in the wood cells. Decays slowly but surely the timber and take the place of the minerals in the wood cells.
The fossilisatieproces goes very slowly so that the structure of the wood remains perfectly preserved in minerals. Petrified wood does not contain any real wood, but only the tree print formed by minerals. These pieces are from Madagascar to 220 million years old!