16 1

Geologic Principles

• What geologic principles are shown in this diagram?

17 2

Sequences of Events: What is the order of each event shown?

19 3

Radiometric Dating

• U-Pb decay curve• How much of the

daughter element is remaining after 4 half lives?

• What is the age of the sample?

20 4

Potassium-Argon Decay Series

21 5

Parent and Daughter Nuclides

22 6

Cross-Cutting Relationships, Superposition and Correlation

• Determining the age of sedimentary strata by correlation

23 7

Cross-Cutting Relationships

• How old (numerical age) is rock unit A?

• How old (numerical age) is rock unit B?

• How old (numerical age) is rock unit C?

25 8

Note the changes in the time scale as it was revised. What do you think are the reasons for this?