# Sedimentary rock age dating

To determine the ages of these specimens, scientists need an isotope with a very long half-life. Each of them typically exists in igneous rock, or rock made from cooled magma. Take students on a neighborhood walk and see what you can observe about age dates around you. However, sedimentary rocks can be age dated if a volcanic ash horizon or a diabase sill or dyke can be found within the sequence. The assumptions which underlie radiometric dating are covered in our radiometric dating article published here.

But this sediment doesn't typically include the necessary isotopes in measurable amounts. But, the decay elements need to be set, much like you would re-set a stop watch for a runner, to ensure an accurate measurement. Other techniques include analyzing amino acids and measuring changes in an object's magnetic field. Other Dating Methods Radiometric dating isn't the only method of determining the age of rocks. This of course presupposes that radiometric dating works consistently as a dating technique in the first place.

No bones about it, fossils are important age markers. Each radioactive isotope works best for particular applications. This method works because some unstable radioactive isotopes of some elements decay at a known rate into daughter products. Scientists believe they can indirectly date sedimentary rocks using radiometric dating if they find igneous or metamorphic rock imbedded in or around a sedimentary rock layer.

Not all rocks have radioactive elements. Radiometric dating determines how long ago the liquid rock solidified into solid rock. Because the elements used for dating need to be re-set by volcanism. By using radiometric dating to determine the age of igneous brackets, researchers can accurately determine the age of the sedimentary layers between them. If a rock has been partially melted, or otherwise metamorphosed, that causes complications for radiometric absolute age dating as well.

Sedimentary rocks in particular are notoriously radioactive-free zones. This rule is common sense, but it serves as a powerful reference point.

## Sedimentary and metamorphic rocks and age determination

This technique is generally used to date igneous and metamorphic rock, which are rocks that were once melted due to extreme heat and pressure. So to determine the age of sedimentary rock layers, researchers first have to find neighboring layers of Earth that include igneous rock, such as volcanic ash. But the most accurate forms of absolute age dating are radiometric methods. Using the basic ideas of bracketing and radiometric dating, researchers have determined the age of rock layers all over the world.

Radioactive elements decay at a certain constant rate and this is the basis of radiometric dating. This rate of decay is called a half-life. You might have noticed that many of the oldest age dates come from a mineral called zircon. Half-life simply means the amount of time it takes for half of a remaining particular isotope to decay to a daughter product.

The extreme temperatures of the magma would just destroy the bones. Sedimentary rocks may have radioactive elements in them, but they have been re-worked from other rocks, so essentially, there radiometric clock has not been re-set back to zero. Since the moon and the Earth probably formed at the same time, this supports the current idea of the Earth's age. You can then infer that the dino must have lived some time between these two age dates.

This is called the Rule of Superposition. When minerals get subducted into the Earth and come back as volcanic magmas or ash, this essential re-sets the radiometric clock back to zero and therefore a reliable age date is possible. You can learn more about fossils, dinosaurs, radiometric dating and related topics by reading through the links below. Scientists have also made improvements to the standard radiometric measurements. The sedimentary particles predate the rock which they form.

Unfortunately, these elements don't exist in dinosaur fossils themselves. Some of the isotopes used for this purpose are uranium, uranium and potassium, each of which has a half-life of more than a million years.

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