This article needs attention from an expert in Geology. The specific problem is: quick g-search reveals this definition is way too narrow. I don't know enough to expand it properly.WikiProject Geology (or its Portal) may be able to help recruit an expert.(February 2009)
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.