Carbonaceous film
Overview
 
A carbonaceous film is an organism outline of a fossil
Fossil
Fossils are the preserved remains or traces of animals , plants, and other organisms from the remote past...

. It is a type of fossil found in any rock
Rock (geology)
In geology, rock or stone is a naturally occurring solid aggregate of minerals and/or mineraloids.The Earth's outer solid layer, the lithosphere, is made of rock. In general rocks are of three types, namely, igneous, sedimentary, and metamorphic...

 when organic material is compressed, leaving a thick carbon
Carbon
Carbon is the chemical element with symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds...

 film.
 
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