m (Ngarapihkeun éjahan, replaced: mangrupakeun → mangrupa using AWB)
[[Image:Trilobite2.jpg|thumb|A permineralized [[trilobite]], ''[[Asaphus kowalewskii]]'']]
Permineralization consists of organic remains being to some degree impregnated by minerals derived from the surrounding sediments or waters. For permineralization to occur, the organism must become covered by sediment soon after death or soon after the initial decaying process. The degree to which the remains are decayed when covered determines the later details of the fossil. Some fossils consist only of skeletal remains or teeth; other fossils contain traces of [[skin]], [[feather]]s or even soft tissues. Once covered with sediment, these layers slowly become compacted and cemented into rock, and the organic remains are slowly replaced with hard minerals.
==Replacement and compression fossils==
''Compression fossils'' such as those of fossil ferns are the result of chemical reduction of the complex organic molecules composing the organism's tissues. In this case the fossil consists of original material, albeit in a geochemically altered state.
To sum up, fossilization processes proceed differently for different kinds of tissues and under different kinds of conditions.
== Fosil hirup ==
== Baca ogé ==
* [http://www.fossilmuseum.net/index.htm Musium Fosil Maya sapanjang Mangsa jeung Evolusi]