Archaeological finds worldwide have helped researchers to fill out the story of human evolution and migration. Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks. Lake Turkana has a geologic history that favored the preservation of fossils. The Age of Dinosaurs was so many millions of years ago that it is very difficult to date exactly. Carbon dating is used to determine the age of biological artifacts up to 50, years old.
The ratio of carbon to carbon at the moment of death is the same as every other living thing, but the carbon decays and is not replaced.
Carbon Dating:. Part of Hall of Human Origins. Many rocks and organisms contain radioactive isotopes, such as U and C This page has been archived and is no longer updated. Seventy years ago, American chemist Willard Libby devised an ingenious method for dating organic materials.
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