8.ESS.4: Relative Dating

Front

Used to determine whether an object is older or younger than other objects

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Relative Dating

Front

States that younger rocks lie above older rocks if the layers have not been disturbed

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Law of superposition

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A break in the geologic record that is made when rock layers are eroded over a long period of time

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Unconformity

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Traces or remains of organisms that lived long ago

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Fossil

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An ordered arrangement of rock layers that is based on the relative ages of the rocks

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Geologic Column

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What is the law of superposition?

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Sedimentary rock in its original position is older than layers above it.

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How does the law of crosscutting explain the age of a fault?

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The fault is younger than the rocks it cuts through.

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Analyze the seashell found in the white layer.  Which statement is true of the rock layer that contains this fossil?

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It is older than the layers above it.

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How do geologists use relative dating? Options: Placing rocks in order from youngest to oldest, Placing rocks in order by minerals they contain, Classifying rocks by different textures, Classifying rocks by different isotopes

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Placing rocks in order from youngest to oldest

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What are the relative ages of the features in order from oldest to youngest? Limestone, Basalt, Fault, Siltstone, Siltstone, Fault, Basalt, Limestone, Limestone, Fault, Basalt, Siltstone, Limestone, Siltstone, Fault, Basalt

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Limestone, Siltstone, Fault, Basalt