petrifaction(redirected from petrifactions)
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remains or imprints of plants or animals preserved from prehistoric times by the operation of natural conditions. Fossils are found in sedimentary rock, asphalt deposits, and coal and sometimes in amber and certain other materials.
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the conversion of the remains of animals and plants into fossils as a result of the action of a number of factors: temperature and pressure,- the replacement of skeletal matter by other mineral substances, and the filling of cavities in organic residue by other mineral substances.