Fossils

Fossils - Fossils Paleontologist Paleontologist Types of...

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Unformatted text preview: Fossils Paleontologist Paleontologist Types of Fossils Types Fossils Continued Fossils Fossils Continued Fossils Relative Dating Relative Absolute Dating Absolute Determining an exact date of a fossil specimen by measuring the amount of radioactive isotopes still in that specimen. Half-life of Radiation Radioisotope remaining (%) Initial amount of radioisotope 100 After 1 half-life After 2 half-lives 50 After 3 half-lives t1/2 25 t1/2 12.5 0 t1/2 1 2 3 Number of half-lives 4 Half­life (t½) Half­life (t Time required for half the atoms of a radioactive nuclide to decay. Shorter half­life = less stable. Potassium Argon Calcium Ratio of Remaining Potassium-40 Atoms to Original Potassium-40 Atoms 1/1 Newly formed rock 1/2 1/4 1/8 1/16 0 0 1 half-life 1.3 1 half-lives 2.6 3 half-lives 3.9 Time (billions of years) 1 half-lives 5.2 ...
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