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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.By dating these surrounding layers, they can figure out the youngest and oldest that the fossil might be; this is known as "bracketing" the age of the sedimentary layer in which the fossils occur.

Scientists determined the Earth's age using a technique called radiometric dating. Charles Darwin (1809–1882)The” father of modern geology” who was a proponent of Plutonism as one aspect of Earth formation but is best remembered for proposing what is now the Theory of Uniformitarianism. Charles Darwin (1809–1882)Which of the following was the first geological engineer who served as a consultant to the canal building companies in England, and later constructed the first geologic map? Plus, get practice tests, quizzes, and personalized coaching to help you succeed.Free 5-day trial Radiometric dating is used to estimate the age of rocks and other objects based on the fixed decay rate of radioactive isotopes.

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