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Biostratigraphy: One of the first and most basic scientific dating methods is also one of the easiest to understand.Layers of rock build one atop another — find a fossil or artifact in one layer, and you can reasonably assume it’s older than anything above it.

One of the most widely used and well-known absolute dating techniques is carbon-14 (or radiocarbon) dating, which is used to date organic remains.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.Methods fall into one of two categories: relative or absolute." After 30 - 60 seconds, we come back together and discuss, where I solicit a few responses.Most of them are able to do this pretty easily, after which I ask "why? But in the discussion, I also mention that even though we know who is oldest, youngest, and their relative order, we don't know After the introduction, we take some time to whole group read over the brief text on relative/absolute dating.Geologists establish the age of rocks in two ways: numerical dating and relative dating.

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