Radiometric dating school class


29-Dec-2017 12:05

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Replacement occurs when the shell, bone or other tissue is replaced with another mineral.In some cases mineral replacement of the original shell occurs so gradually and at such fine scales that microstructural features are preserved despite the total loss of original material.The empty spaces within an organism (spaces filled with liquid or gas during life) become filled with mineral-rich groundwater.Minerals precipitate from the groundwater, occupying the empty spaces.

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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.

Often what remains is a carbonaceous film known as a phytoleim, in which case the fossil is known as a compression.