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They include amino acid racemization, useful in measuring shells and other bicarbonates between 500 and 300,000 years old, and obsidian hydration, used to measure natural glass between 500 to 200,000 years old.

These methods are not so useful in measuring the age of fossils and bones but they are useful in measuring the age of objects such as beads and shellfish eaten as food found with fossils and bones.

Each of them typically exists in igneous rock, or rock made from cooled magma.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.These layers are like bookends -- they give a beginning and an end to the period of time when the sedimentary rock formed.Once you have an idea how old an ash layer is in an outcrop, that’s one of the tools you can use to help estimate the age of sedimentary layers as well as the age of fossils that may be present in the sedimentary layers.The most widely known form of radiometric dating is carbon-14 dating.

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