09 24-2013-relative age

How do we find the relative age of rocks and fossils?

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Remember when we did this?

Relative Age

How did we arrange ourselves?

Relative Age

Relative Age: comparison of ages – is it younger or older than the rocks/fossil layers around itoSuperposition – older rock is below

younger rockoIndex Fossils – fossils of organisms

that lived for a relatively short period of time

Relative vs Absolute Age

Absolute age: how long since the rock or fossil was formedoFound using radiometric dating

Relative vs Absolute Age

SuperPosition

You Try!

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You Try

Retrieved from here

Geologic Column

From Holt Science and Technology Georgia Earth Science

1. How many layers are there in your geologic column?

2. Which layer is oldest? Which layer is youngest? How do you know?

3. What fossil is the oldest?4. What fossils can be considered

index fossils? Why?

Reflection on Page 31