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Fossil.
Fossil
Fossils are the mineralized remains of animals or plants or other artifacts such as footprints. The totality of fossils and their placement in rock formations and sedimentary layers is known as the fossil record.
Fossilization is a rare occurrence, because natural materials tend to be recycled. In order for an organism to be fossilized, the remains need to be covered by sediment as soon as possible. There are different types of fossils, and fossilization processes:
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1 Permineralization
2 Mould, cast and trace fossils
3 Resin fossils
4 Pseudofossils
5 Living fossils
Permineralization
This process consists of literally turning an organism into stone. The organism gets covered by sediment soon after death, or after the initial decaying process. The degree in which the remains are decayed when covered, determines the later details of the fossil. Some fossils only consist of skeletal remains or teeth; other fossils contain traces of skin, feathers or even soft tissues. Once covered with sediment, these layers slowly compact to rock, after which the chemicals in the remains are slowly replaced with hard minerals.
Mould, cast and trace fossils
If percolating water dissolves the remains of an organism, and thereby leaves a hole, this is called a mould fossil. If this hole is filled with more minerals, it is called a cast fossil. If the burial of the organism was rapid, then chances are that even impressions of soft tissues remain. Trace fossils are the remains of track ways, burrows, footprints, eggs and shells, nests and droppings. The latter, called coprolites, can give insight in the feeding behavior of animals and can therefore be of great importance.
Resin fossils
Smaller animals, insects, spiders and small lizards, can be trapped in resin (amber), which oozes from trees. These fossils can be found in sandstones or mudstones.
Pseudofossils
These are regular patterns in rocks, which are produced by naturally occurring processes. They can easily be mistaken for real fossils. These fossils can be formed by naturally formed fissures in the rock that get filled up by percolating minerals. Other types of pseudofossils are kidney ore, round shapes in iron ore, and 'moss agates', which look like plant leaves.
Living fossils
A term used for any living species which closely resembles a species known from fossils, i.e., as if the fossil had "come to life". This can be a species known only from fossils until living representatives were discovered (the most famous example of this is the coelacanth fish, Latimeria chalumnae), or a single living species with no close relatives, but which is the sole survivor of a once large and widespread group in the fossil record (the best-known example of this is the ginkgo tree, Ginkgo biloba). Other "living fossils" are the nut clams (Ennucula superba), Lingula anatina, an inarticulate brachiopod, the tuatara, and the horseshoe crab (Limulus polyphemus).
Additional information see Fossils and the geological timescale
The study of fossils is called paleontology.
See also: fossil fuels, acritarchs, transitional fossils
Fossil is also the tradename of the manufacturer of a popular line of watches and jewelry in the United States. See Fossil, Inc.
FOSSIL is the name of a protocol for serial communications.
The above article is adapted from from Wikipedia All Wikipedia article text is available under the terms of the GNU Free Documentation License
Genes, Peoples, and Languages by Luigi Luca Cavalli-Sforza
National Audubon Society Field Guide to Fossils by Ida Thompson
Wonderful Life: The Burgess Shale and the Nature of History by Stephen Jay Gould
Bones of Contention: A Creationist Assessment of the Human Fossils by Marvin L. Lubenow
In the Blink of an Eye by Andrew Parker
Sea Dragons: Predators of the Prehistoric Oceans by Richard Ellis
Smithsonian Handbooks: Fossils by Cyril Walker
The First Fossil Hunters: Paleontology in Greek and Roman Times. by Adrienne Mayor
Megalodon: Hunting the Hunter by Mark Renz
Dinosaur Bones by Aliki
From Lucy To Language by Donald Johanson
Fossils Tell of Long Ago by Aliki
Walking with Prehistoric Beasts by Tim Haines
Digging Up Dinosaurs by Aliki
The Best Book of Fossils, Rocks, and Minerals by Chris Perrault
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