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Scientists date igneous rock using elements that are slow to decay, such as uranium and potassium.Fossils are generally found in sedimentary rock not igneous rock.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.Finding them is easy with our totally FREE Berkeley dating service.Sign up today to browse the FREE personal ads of available California singles, and hook up online using our completely free Berkeley online dating service!