1. Relative Dating

2. Original Horizontality
Layers of sediment are deposited evenly, with each new layer formed horizontally over older layers

3. Superposition
In an undeformed sequence of rocks, each layer is younger than the one below.

5. Cross Cutting
An igneous intrusion or fault that cuts through preexisting rock is younger than the rock it cuts through

9. Inclusions are pieces of rock contained within another
Any inclusion is older than the rock containing it.

11. Fossil organisms succeed one another in a definite, irreversible order
Faunal Succession
Fossil organisms succeed one another in a definite, irreversible order
Fossils can be used to correlate rocks of similar age in different regions

13. Unconformities
Disruptions in the rock record caused by folding, uplifting, and erosion

15. FAULT
INTRUSIONS
EROSION
FOLD