Fossil wood designates the remains of plants from older geological periods, which after dying out found themselves quickly enough in a suitable environment, where their decomposition – rotting – was prevented. Such conditions subsisted in the distant past and still subsist today, for example in marshes, mud, silt, sand, volcanic sand and ash, resin, earthwax, tar … The long-lasting physico-chemical process in which a dead organism transforms into a fossil is called fossilization.

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