For example, an age can be estimated for a strata of rock based on the age of the skeletons it holds. Libby, a professor at the University of Chicago, in 1949.Libby compared C14 samples from wood in an Egyptian tomb with that from living trees to determine the half-life of C14.
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.
These methods — some of which are still used today — provide only an approximate spot within a previously established sequence: Think of it as ordering rather than dating.
Biostratigraphy: One of the first and most basic scientific dating methods is also one of the easiest to understand.
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For example, creationist writer Henry Morris [Morris2000, pg.