Wikipedia:Picture of the day/April 6, 2005

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Picture of the day

Petrified wood

Petrified wood is a type of fossil, in which the tissues of a dead plant are replaced with minerals (most often a silicate, like quartz). The petrifaction process occurs underground, when wood or woody materials suddenly become buried under sediment. Mineral-rich water flowing through the sediment deposits minerals in the plant's cells and as the plant's lignin and cellulose decays away, a stone cast is left in its place.

Photo credit: Daniel Schwen
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