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There are two types of age determinations. Geologists in the late 18th and early 19th century studied rock layers and the fossils in them to determine relative age. William Smith was one of the most important scientists from this time who helped to develop knowledge of the succession of different fossils by studying their distribution through the sequence of sedimentary rocks in southern England. It wasn't until well into the 20th century that enough information had accumulated about the rate of radioactive decay that the age of rocks and fossils in number of years could be determined through radiometric age dating. This activity on determining age of rocks and fossils is intended for 8th or 9th grade students.
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SECTION Can geologists use radioactive dating to find the absolute ages of sedimentary and Explain whaker why net met Dedimento mbing up the rock. Date. Class. Review and Reinforce. Radioactive Dating. Understanding Main Ideas What is the relative age of rock layer C? Explain how you determined.
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