1. Relative age of rocks

2. Think pair share

3. Law of Superposition Top = youngest layer
In undisturbed sedimentary rock or lava flows
In undisturbed sedimentary rock or lava
Top = youngest layer
Bottom = oldest layer
The Law of Superposition is that an undeformed sedimentary rock layer is older than the layers above it and younger than the layers below it.

4. Law of Cross-Cutting Relationships
Any feature that cuts across a rock or layer of sediment is younger than the rock or layer it cuts
youngest layer

5. Example of Cross-Cutting
Intrusion - igneous rock that forms when magma squeezes between existing rock and hardens
Intrusion - igneous rock that forms when magma squeezes between existing rock and hardens

6. Example of Cross-cutting
Examples of Cross-Cutting
Extrusion - igneous rock that forms when lava
flows on Earth’s surface and hardens

7. Example of Cross-cutting Example of Cross-cutting
Inclusion - pieces of older rock trapped within younger rock

8. Examples of Cross-Cutting
Faults, joints, tilts, and veins also follow the
law of cross--cutting relationships

9. Formation of an Unconformity

10. Formation of an Unconformity

11. Formation of an Unconformity

12. Formation of an Unconformity

13. Formation of an Unconformity

14. Picture of Unconformity