Carbonaceous film

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Carbonaceous film of a Viburnum lesquereuxii leaf with insect damage; Dakota Sandstone (Cretaceous) of Ellsworth County, Kansas. Scale bar is 10 mm.

A carbonaceous film is an organism outline of a fossil. It is a type of fossil found in any rock when organic material is compressed, leaving a thick carbon film.

When an organism is buried under many layers of sediment, pressure and heat may build up, leaving this thin film of carbon residue on rock surfaces.

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