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Explain why both relative hookup and absolute hookup are necessary to develop the fossil record

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Explain why both absolute dating and relative dating are used to determine the age of fossils.? Are you sure you want to delete this answer?

Absolute dating uses radiological techniques to get an "absolute" age plus or minus error of a rock. Fossils are almost never found in rock which can be absolutely aged, because they occur in sedimentary rock. Only igneous and some metamorphic rocks may be absolutely dated. So, relative dating is used to date fossils, such as, you know one layer of rock is million years old, the fossil occurs above it, so the fossils are less than million years old. Hopefully there will be another rock that you can absolutely date between the other rock, say, 50 million years old, and you can say that the fossil animal was around from million years old.

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Absolute radiometric dating is used to date igneous rocks with known stratigraphic relationships to sedimentary sequences, bracketing the age of those sedimentary rocks and any fossils they contain - this is how much of the geological column has been calibrated.

The overwhelming majority of fossil material is unsuitable for direct radiometric dating, so the only way to estimate the age of most fossils is to use their stratigraphic position, and then use the stratigraphy stratigraphy effectively is a form of relative dating to trace back to one or more sections where there are directly dated layers such as volcanic ashes - i. There are a few exceptions, for example, where fossils are preserved in water-lain volcanic ash, the rock layer in which they are embedded may be directly dateable by radiometric means.

A small minority of fossils can also be directly dated. Think out of the box when it comes to dates.

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