4 rules of relative dating

The narrower a range of time that an animal lived, the better it is as an index of a specific time.No bones about it, fossils are important age markers.For example, which is older, the bricks in a building or the building itself?Are there repairs or cracks in the sidewalk that came after the sidewalk was built?

There are two basic approaches: relative age dating, and absolute age dating.To determine the relative age of different rocks, geologists start with the assumption that unless something has happened, in a sequence of sedimentary rock layers, the newer rock layers will be on top of older ones. This rule is common sense, but it serves as a powerful reference point.

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