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Some fossils are biochemical and are called chemofossils or biosignatures.Permineralization is a process of fossilization that occurs when an organism is buried.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.The totality of fossils is known as the fossil record.

The remaining organism-shaped hole in the rock is called an external mold.A shell is said to be recrystallized when the original skeletal compounds are still present but in a different crystal form, as from aragonite to calcite.Compression fossils, such as those of fossil ferns, are the result of chemical reduction of the complex organic molecules composing the organism's tissues.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.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.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.Often what remains is a carbonaceous film known as a phytoleim, in which case the fossil is known as a compression.Often, however, the phytoleim is lost and all that remains is an impression of the organism in the rock—an impression fossil.

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