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However, rocks and other objects in nature do not give off such obvious clues about how long they have been around.So, we rely on radiometric dating to calculate their ages.If a number of samples are analyzed and the results are shown to define a straight line within error, then a precise age is defined because this is only possible if each is a closed system and each has the same initial ratio and age.The uncertainty in determining the slope is reduced because it is defined by many points.

The research included analyzing pictographs from numerous countries over a span of 15 years."But with the ability to obtain reliable radiocarbon dates on pictographs, archaeologists have now begun to incorporate rock art into a broader study that includes other cultural remains." Archaeologists have discovered a cluster of 12 unusual stones in the back of a small, prehistoric rock-shelter near the town of Boquete in Panama.The cache represents the earliest material evidence ...To progress, it is essential to apply the second type, or relative, dating.The term refers to the fact that an approximate date can be inferred by comparison with something else of known age.

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