A fossil is formed when the dead organism is buried in rock or parts of rock called sediments. The more sediment that builds up on plants or animals the more pressure and heat it is shown too,then circumstances force gas and liquid from the organism. A residue is left from the carbon which forms the outline of the body. This results in carbonaceous film.
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A coal-like residue, bulids up and forms around something to form a fossil. This fossil should be classified as a carbon-film fossil.