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Relative vs. Absolute/Radiometric Fossil Dating

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Relative vs. Absolute/Radiometric Fossil Dating

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Relative dating is a way to roughly estimate the age of a fossil by comparing it to the placement of fossils in other layers of rock. Radiometric fossil dating is a way to precisely measure the age of a fossil by looking at the amount of the unstable isotopes carbon-14 and nitrogen-14 inside the fossil.

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Fossils which existed during specific spans of time over large areas. Index fossils can be used to date layers of rock. An example of an index fossil are trilobite fossils, which exited about 250-500 million years ago.

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Transitional fossils are fossils which serve as an intermediate between two species. An example is a fossil of a Basilosaurus, which is a species with a whale-like body, but has limbs of land mammals.

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Fossils are remnants of organisms that existed in the past. There are many different types of fossils and many different ways fossils can be made. Permineralization occurs when minerals replace the remains of an animal over time. Casts occur when an animals imprint is left in the ground Trace fossils are fossils which show signs of animal activity such as footprints. Amber fossils occur when organisms are trapped in resin that hardens over time. Preserved remains occur when an entire organism is trapped in a material such as ice or ash or is preserved in a bog.

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The study of fossils and prehistoric life. An example would be the study of dinosaurs.