Age Dating Using Fossils

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Dating Fossils - How Are Fossils Dated? - FossilEra .com
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Relative dating is used to determine a fossils approximate age by comparing it to similar rocks and fossils of known ages . Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it . Relative Dating
Scientists use carbon dating when determining the age of fossils that are less than 60,000 years old, and that are composed of organic materials such as wood or leather . Key Terms half-life : The time required for half of the nuclei in a sample of a specific isotope to undergo radioactive decay .
One way of dating fossils relies on their relative positions in the ground . When paleontologists dig deeper in sedimentary rock they are, in effect, looking back in time . As sediments carried by wind and water accumulate, they bury older layers—so the bottom layers in a geological sequence are usually the oldest and the top layers the youngest .
In archeology, carbon dating is a popular method of estimating the age of artifacts and fossil remains . However, since it has a half-life of 5730 years, it is unsuitable for dating fossils older than 75,000 years . Hence, potassium-40 is used as it has a half-life of 1 .2 billion years and is quite abundant in fossils and surrounding rocks .
There are two ways that scientists use fossils to determine the evolutionary history of organisms . They are called Relative Dating , and Absolute Dating . In relative dating , scientists can observe how deep a fossil is buried, and what it is buried around . This can help in making a rough estimate of the fossil's age .
In order to date older fossils , scientists use uranium-lead dating and potassium-argon dating . The half-life of uranium-235 is 700 million years, and the half-life of potassium-40 is 1 .3 billion years . In order to estimate the age of incredibly old fossils , scientists date the age of the igneous (volcanic) rock in which the fossils are buried .
Lab 8 Fossils , Age Dating Lecture Use of fossils : - Correlation - Paleoenvironments - Age Dating - Biozone: - Range Zone: The use of one species/genus to determine the age - Requires the use of index fossils : 1) Abundance - readily available 2) Wide geographic Range - usefulness proportional to extent of area found 3) Rapid Evolutionary Pattern - short geologic time range 4) Rapid . . .
Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it . When the sun's rays shine on the animals or plants and when this collides .
First, as previously pointed out, radiometric dating of Mesozoic strata using radioisotopes other than radiocarbon shows that Mesozoic fossils are 65-251 million years old (Gradstein et al ., 2004), far too old for any measurable amount of original radiocarbon to remain . Second, the collagen in Mesozoic bone has usually long since decayed away . . .
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Age Dating Using Fossils