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1.) An organism that lived only for a short part of earth's history.

2.) The fossils must be found over a wide area of earth.

3.) Many fossils of that organism have to be found all over the world

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A carbonaceous film or carbon film is an organism outline of a fossil

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A fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.

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This occurs when the pores of the plant materials, bones, and shells are impregnated by mineral matter from the ground, lakes, or ocean. ... Petrification occurs when the organic matter is completely replaced by minerals and the fossil is turned to stone.

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Most fossils are hardened animal remains such as shells, bones, and teeth. Minerals replace the remains, forming a fossil of the hard skeletal body parts. Other fossils are impressions or other evidence of an organism preserved in rock.

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Minerals gradually enter into the cavity, resulting in a cast, also called a mold fossil, which is in the general form of the original organism.

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When an animal, plant, or other organism dies and is covered by sediment, its flesh decays and bones deteriorate due to chemical reactions, and a cavity remains below the ground surface.