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The two main types of dating methods are relative and absolute.Relative dating methods are used to determine only if one sample is older or younger than another.Similarly, pollen grains released by seed-bearing plants became fossilized in rock layers.The world of dating in America has changed dramatically over the last century.

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Since lower-class families did not have the resources to entertain potential suitors in their home, many couples began leaving the house to spend time together.The good dates are confirmed using at least two different methods, ideally involving multiple independent labs for each method to cross-check results.Sometimes only one method is possible, reducing the confidence researchers have in the results. “They’re based on ‘it’s that old because I say so,’ a popular approach by some of my older colleagues,” says Shea, laughing, “though I find I like it myself as I get more gray hair.” Kidding aside, dating a find is crucial for understanding its significance and relation to other fossils or artifacts.The main relative dating method is stratigraphy (pronounced stra-TI-gra-fee), which is the study of layers of rocks or the objects embedded within those layers.This method is based on the assumption (which nearly always holds true) that deeper layers of rock were deposited earlier in Earth's history, and thus are older than more shallow layers.

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