1. the
is the to
the

2. Understanding the present is the key to understanding the past
Principle of Uniformitarianism
Understanding the present is the key to understanding the past

3. Absolute Dating Relative Dating
Describing the Past
Absolute Dating Relative Dating

4. Geologic Profile

5. Relative Dating Rules
Principal of Superposition – Older sedimentary rock layers are found below younger sedimentary rock layers.

6. Inclusions
Inclusions are older than the areas they are included in.

7. Igneous Intrusion/Cross Cutting
Younger than the rocks they intrude or cut across.

8. Must be younger than the rocks they actually break.
Faults
Must be younger than the rocks they actually break.

9. Must have happened after the rocks they folded were deposited.
Folds
Must have happened after the rocks they folded were deposited.

10. Unconformity A period of erosion or non-deposition.
Marked by a surface exposed to weathering and erosion.

11. Relative Dating