Permineralization is a process of fossilization that occurs when an organism is buried.

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The observation in the 19th century that certain fossils were associated with certain rock strata led to the recognition of a geological timescale and the relative ages of different fossils.

The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the absolute ages of rocks and the fossils they host.

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Paleontology is the study of fossils: their age, method of formation, and evolutionary significance.

Specimens are usually considered to be fossils if they are over 10,000 years old.

The remaining organism-shaped hole in the rock is called an external mold.