How are carbon film fossils formed?

Answer

Carbon film fossils are formed through a process known as carbonization; this process preserves a living thing, typically a leaf, feather, crustacean or fish, as a thin layer of carbon. These fossils are typically made through compression and are generally flat, with a thin layer of carbon showing the fossil's outline (hence the name carbon film).

While compression, or strong downward pressure, is typically responsible for carbon film fossils, this does not tell the whole story of how these lasting impressions are made. In addition to the compression aspect of the formation process, the future fossil's organic material slowly decomposes and changes over time, with processes like polymerization of lipids (fats) and volatilization of basic elements such as hydrogen and nitrogen taking place. Eventually, the bulk of the organic material that was originally part of the leaf, feather or animal dissolves, leaving only a thin, black layer of carbon behind.

Carbonization doesn't have to refer to fossils that were preserved under this exact process. Some paleontologists may refer to any dark, flat fossil as a carbonization, though it may not exactly be a proper example of carbon film. True carbon film fossils earn that name by being composed primarily of carbon, a highly abundant mineral that causes the dark color of these fossils.

Q&A Related to "How are carbon film fossils formed?"
Carbon film fossils formed when a very thin layer of carbon covers a rock.
http://wiki.answers.com/Q/How_are_carbon_film_foss...
Fossils are formed when an animal dies and its remains are covered with sediment over time. Pressure and time will then cause the sediment to turn to stone with the remains trapped
http://www.ask.com/web-answers/Science/Nature/how_...
Carbon film is an extremely thin coating of carbon on rocks or fossils. All living
http://www.chacha.com/question/how-do-carbon-film-...
1. Calculate the number of atoms of carbon in the sample. Twelve grams of carbon equals one mole, which is 6.022 x 10^23 atoms. One pound of carbon would therefore contain approximately
http://www.ehow.com/how_8503421_calculate-carbon14...
Explore this Topic
A carbon film fossil is a type of rock material with a small layer of carbon. Since everything that lives contains some amount of carbon in them when an organism ...
Fossil fuel is non-renewable, because it takes a long time to form. Fossil fuels are fuels formed from natural processes. They have a large percentage of carbon. ...
Coal is a naturally occurring combustible material that mainly contains the element carbon. Coal is often referred to as a fossil fuel because it is formed when ...
About -  Privacy -  Careers -  Ask Blog -  Mobile -  Help -  Feedback  -  Sitemap  © 2014 Ask.com