Explain How Dating Methods Are Used To Analyze Fossil Evidence

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Dating Fossils - How Are Fossils Dated? - FossilEra .com
Different Techniques for Dating Fossils | AMNH
Dating Fossils in the Rocks | National Geographic Society
How Do Scientists Date Fossils? | At the Smithsonian . . .
Fossil Dating - Evidence for Evolution
Dating Techniques | Encyclopedia .com
Radiometric dating - Understanding Evolution
DK Science: Dating Fossils - Fact Monster
How archaeologists determine the date of ancient sites and . . .
21 Ways Archaeologists Date Ancient Artifacts - HubPages
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There are two main methods determining a fossils age, relative dating and absolute dating . 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
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 .
Dating of the fossils contributes to a clearer timeline of evolutionary history . Older methods of dating were more subjective, often an educated hypothesis based on the evidence available . However, the fossils in the Turkana region can be dated more accurately because they are found in the sedimentary rock between datable layers of tuff .
Another common method , uranium-lead dating , relies on the radioactive decay of uranium and can be used to date rocks containing the oldest known fossils on Earth—older than 3 .5 billion years old!
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 .
Dating techniques are procedures used by scientists to determine the age of rocks, fossils , or artifacts . Relative dating methods tell only if one sample is older or younger than another; absolute dating methods provide an approximate date in years . The latter have generally been available only since 1947 .
So in order to date most older fossils , scientists look for layers of igneous rock or volcanic ash above and below the fossil . Scientists date igneous rock using elements that are slow to decay, such as uranium and potassium . By dating these surrounding layers, they can figure out the youngest and oldest that the fossil might be; this is known as "bracketing" the age of the sedimentary layer in which the fossils occur .
DK Science: Dating Fossils . Dating a dinosaur skeleton . Rock layers of a cliff face . Index fossils . Radiometric dating . The Age of Dinosaurs was so many millions of years ago that it is very difficult to date exactly . Scientists use two kinds of dating techniques to work out the age of rocks and fossils . The first method is called relative dating .
Absolute dating . Perhaps the most famous absolute dating technique, radiocarbon dating was developed during the 1940s and relies on chemistry to determine the ages of objects . Used on organic . . .
In fact, any lead found in zircon is a product of radiometric decay . Lead-lead dating is another method that can be used ; it measures the level of isotopes in lead, the measurements of which can be used for dating very old rocks . 8 . Fission Track . Fission track dating was developed in the mid 1960s .
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Explain How Dating Methods Are Used To Analyze Fossil Evidence