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Fossils may also consist of the marks left behind by the organism while it was alive, such as animal tracks or feces (coprolites).These types of fossil are called trace fossils or ichnofossils, as opposed to body fossils.The totality of fossils is known as the fossil record.Paleontology is the study of fossils: their age, method of formation, and evolutionary significance.For permineralization to occur, the organism must become covered by sediment soon after death or soon after the initial decay process.The degree to which the remains are decayed when covered determines the later details of the fossil.

Because of their antiquity, an unexpected exception to the alteration of an organism's tissues by chemical reduction of the complex organic molecules during fossilization has been the discovery of soft tissue in dinosaur fossils, including blood vessels, and the isolation of proteins and evidence for DNA fragments.

is any preserved remains, impression, or trace of any once-living thing from a past geological age.

Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, hair, petrified wood, oil, coal, and DNA remnants.

In 2014, Mary Schweitzer and her colleagues reported the presence of iron particles (goethite-a Fe O(OH)) associated with soft tissues recovered from dinosaur fossils.

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Based on various experiments that studied the interaction of iron in haemoglobin with blood vessel tissue they proposed that solution hypoxia coupled with iron chelation enhances the stability and preservation of soft tissue and provides the basis for an explanation for the unforeseen preservation of fossil soft tissues.If this hole is later filled with other minerals, it is a cast.