Relative dating using index fossils

Question Exploration Routine is an instructional methods that teachers can use to help a diverse student population understand a body of content information by carefully answering a critical question to arrive at a main idea answer. The Concept Comparison Routine is used help compare and contrast key concepts. Specifically, students use like and unlike characteristics and categories shared and not shared by two or more concepts to better understand the overall concept. Students taught using the Content Enhancement routines earned higher total test scores than did students taught using the lecture-discussion method.
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Question Exploration: How do Index Fossils Help Relative Dating of Rock Layers?

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Dating Fossils – How Are Fossils Dated? -

Teaching about Earth's history is a challenge for all teachers. Time factors of millions and billions of years is difficult even for adults to comprehend. However, "relative" dating or time can be an easy concept for students to learn. Once they are able to manipulate the cards into the correct sequence, they are asked to do a similar sequencing activity using fossil pictures printed on "rock layer" cards. Sequencing the rock layers will show students how paleontologists use fossils to give relative dates to rock strata.
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Relative dating

Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence. The method of reading the order is called stratigraphy layers of rock are called strata. Relative dating does not provide actual numerical dates for the rocks. Next time you find a cliff or road cutting with lots of rock strata, try working out the age order using some simple principles:. Fossils are important for working out the relative ages of sedimentary rocks.
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Index fossils are fossils of organisms that lived during only one short period of time. A layer rock with an index fossil in it is close in age to another layer of rock with the same type of index fossil in it. Even though rock layers are of different regions, index fossils indicates that the layers are close in age.
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