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09-Jul-2019 21:07

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Most of the relative-dating techniques attempted were successful in differentiating the terraces of the Owens River sequence.

In addition, weathering rinds, soil descriptions, and an early Holocene C date for the youngest terrace support correlation of the three terrace levels with the three post-Sherwin-age glacial stages (Tioga, Tahoe, and pre-Tahoe) found in nearby canyons of the Sierra Nevada.

Carbon-14, the radioactive isotope of carbon used in carbon dating has a half-life of 5730 years, so it decays too fast.

It can only be used to date fossils younger than about 75,000 years.

These isotopes break down at a constant rate over time through radioactive decay.

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These differences probably reflect the difference in relief, such that slow erosion of the moraine crests may have retarded soil development relative to the flat terrace surfaces and altered surface-weathering processes.

Archaeologists have access to various techniques for dating archaeological sites or the objects found on those sites.

There are two main categories of dating methods in archaeology: indirect or relative dating and absolute dating.

Scientists can use certain types of fossils referred to as index fossils to assist in relative dating via correlation.

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Index fossils are fossils that are known to only occur within a very specific age range.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.