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By dating these surrounding layers, they can figure out the youngest and oldest that the fossil might be; this is known as "bracketing" the age of the sedimentary layer in which the fossils occur.Teach your students about absolute dating: Determining age of rocks and fossils, a classroom activity for grades 9-12.To provide access without cookies would require the site to create a new session for every page you visit, which slows the system down to an unacceptable level.This site stores nothing other than an automatically generated session ID in the cookie; no other information is captured.Find additional lessons, activities, videos, and articles that focus on relative and absolute dating.This is a slide and worksheet for radioactive dating and half life activity.Or, just print the graph for all pupils to use independently....

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Sedimentary rocks can be dated using radioactive carbon, but because carbon decays relatively quickly, this only works for rocks younger than about 50 thousand years.Geologists draw on it and other basic principles ( to determine the relative ages of rocks or features such as faults.Relative age dating also means paying attention to crosscutting relationships.There are two basic approaches: relative age dating, and absolute age dating.Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than you.Absolute age dating is like saying you are 15 years old and your grandfather is 77 years old.