Sedimentary rocks can be dated using radioactive carbon, but because carbon decays relatively quickly, this only works for rocks younger than about 50 thousand years.
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Radiocarbon dating using 14 C can be applied to many geological materials, including sediments and sedimentary rocks, but the materials in question must be younger than 60 ka.
The carbon half-life is only years.
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Description: Radiometric dating technique that uses the decay of 14C in organic material, such as wood or bones, to determine the absolute age of the material. Every reversal looks the same in the rock record, so other lines of evidence are needed to correlate the site to the GPTS.