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So in order to date most older fossils, scientists look for layers of igneous rock or volcanic ash above and below the fossil.Scientists date igneous rock using elements that are slow to decay, such as uranium and potassium.These rocks normally form relatively horizontal, parallel layers, with younger layers forming on top.If a fossil is found between two layers of rock whose ages are known, the fossil's age is thought to be between those two known ages.But sometimes, a scientist finds a couple of rock outcrops that are separated by a wide distance.Paleontology seeks to map out how life evolved across geologic time.Radiocarbon dating involves determining the age of an ancient fossil or specimen by measuring its carbon-14 content.
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Love-hungry teenagers and archaeologists agree: dating is hard.Fossils are generally found in sedimentary rock not igneous rock.
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