Carbon film is a type of fossil fuel that forms from the remains of ancient plants and animals. Over millions of years, heat and pressure transform these organic materials into a carbon-rich substance. This process creates a thin layer of carbon that can be found in sedimentary rock formations. In geology, carbon film is important for understanding the Earth's history and the evolution of life. It often preserves delicate details of the original organisms, providing valuable information for scientists studying paleontology and geological processes. Carbon films can also be a source of coal and other fossil fuels used for energy.