Petrified wood
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 The image shows the center of a polished slice of a petrified tree from the late Triassic period (approximately 230 million years ago) found in Arizona. The remains of insects can be detected in an enlarged image. |
Petrified wood (from the Greek root petro meaning "rock" or "stone"; literally "wood turned into stone") is the name given to a special type of fossilized remains of terrestrial vegetation. It is the result of a tree or tree-like plants having completely transitioned to stone by the process of permineralization. All the organic materials have been replaced with minerals (mostly a silicate, such as quartz), while retaining the original structure of the stem tissue. Unlike other types of fossils which are typically impressions or compressions, petrified wood is a three-dimensional representation of the original organic material. The petrifaction process occurs underground, when wood becomes buried under sediment and is initially preserved due to a lack of oxygen which inhibits aerobic decomposition. Mineral-laden water flowing through the sediment deposits minerals in the plant's cells; as the plant's lignin and cellulose decay, a stone mould forms in its place.
| The Petrified forest of Lesvos - Protected Natural... The Petrified forest of Lesvos - Protected Natural Monument www.aegean.gr/Petrified_Forest/NoFrames/petriforest.htm - Web |
| The Town Museum of Nová Paka The Town Museum of Nová Paka www.novapaka.muzeum.cz/index_en.htm - Web |
| The Mississippi Petrified Forest The Mississippi Petrified Forest www.mspetrifiedforest.com - Web |
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