Using Index Fossils
Problem
How can fossils be used to determine the relative ages of rock layers?
Introduction
It is easy to compare the ages of fossils found in sedimentary rocks at one location. Fossils found in an upper rock layer will be younger than fossils found in a lower layer, unless the layers have been overturned. It is not as easy to compare the ages of fossils found in rocks at different locations. Scientists use index fossils to determine the relative ages of rock layers. Scientists use radiometric dating to find the actual age of rocks and fossils.
In this lab, you will work with drawings of rock layers from different locations. Each layer will contain at least two fossils. Using the fossils as clues, you will organize the layers from oldest to youngest.
Skills Focus
Interpret Visuals, Sequence, Draw Conclusions
Materials
- scissors
Safety
Do not direct the points of the scissors toward yourself or others. Use the scissors only as instructed.
Pre-Lab Questions
- Organize Data After you cut out the drawings of the rock layers, how will you begin the process of sorting the layers by age?
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