Earth's History Written in Rocks

Multiple Choice

•  If a rock is inside another rock layer, it is older than the layer.​

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• Inclusion

• Superposition

• Unconformities

• Crosscutting Relationships

Multiple Choice

• Intrusions and faults are always younger than the rock it cuts across.

• ​

• Inclusion

• Superposition

• Unconformities

• Crosscutting Relationships

Multiple Choice

• Gaps in the geologic record

• ​

• Inclusion

• Superposition

• Unconformities

• Crosscutting Relationships

Relative Dating Practice #1 - Labelled diagram

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Relative Dating Practice #2 - Labelled diagram

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Multiple Choice

Which section in this geologic cross section is the oldest?

• J

• C

• K

• H

To find the oldest section, always look at the layer that is at the bottom. J and H are intrusions and therefore younger than K.

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K is the oldest

Multiple Choice

Which of the following sections is the youngest?

• E

• L

• D

• C

L is a fault. Faults are a type of crosscutting relationship, and will always be younger than the rocks layer they cut through.

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L is younger the D, C, and E.

Multiple Choice

Which of the following sections is the youngest?

• G

• L

• E

• A

The youngest section will usually be found at the top. The fault, L, does not cut through A or G, and is therefore older than both A and G.

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A is younger the G, L, or E.