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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.

In many cases, however, compressions and impressions occur together.

For instance, when the rock is broken open, the phytoleim will often be attached to one part (compression), whereas the counterpart will just be an impression.

to dinosaurs and trees, many meters long and weighing many tons.

A fossil normally preserves only a portion of the deceased organism, usually that portion that was partially mineralized during life, such as the bones and teeth of vertebrates, or the chitinous or calcareous exoskeletons of invertebrates.

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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.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.The totality of fossils is known as the fossil record.Paleontology is the study of fossils: their age, method of formation, and evolutionary significance.




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